{"id":15975,"date":"2021-08-03T16:56:09","date_gmt":"2021-08-03T11:26:09","guid":{"rendered":"https:\/\/apboardsolutions.guru\/?p=15975"},"modified":"2021-09-15T20:00:18","modified_gmt":"2021-09-15T14:30:18","slug":"ap-10th-class-physical-science-bits-chapter-3","status":"publish","type":"post","link":"https:\/\/apboardsolutions.guru\/ap-10th-class-physical-science-bits-chapter-3\/","title":{"rendered":"AP 10th Class Physical Science Bits Chapter 3 Refraction of Light at Plane Surfaces"},"content":{"rendered":"

Practice the AP 10th Class Physical Science Bits with Answers<\/a> Chapter 3 Refraction of Light at Plane Surfaces on a regular basis so that you can attempt exams with utmost confidence.<\/p>\n

AP State Syllabus 10th Class Physical Science Bits 3rd Lesson Refraction of Light at Plane Surfaces with Answers<\/h2>\n

CONCEPT – I : Refraction – Refractive index<\/span><\/p>\n

Question 1.
\nThe phenomenon of changing direction of light at interface of the two media when it travels from one medium to another obliquely is called ………………
\nA) Reflection
\nB) Refraction
\nC) Total Internal Reflection
\nD) Diffraction
\nAnswer:
\nB) Refraction<\/p>\n

Question 2.
\nIf v2<\/sub> < v1<\/sub> then medium 2 is said to be ……………… with respect ot medium 1.
\n\"AP
\nA) denser
\nB) rarer
\nC) both
\nD) neither
\nAnswer:
\nA) denser<\/p>\n

\"AP<\/p>\n

Question 3.
\nThe relation between the angle of incidence and the angle of refraction is ……………….. [from the above figure]
\nA) i = r
\nB) i > r
\nC) i < r D) i \u2264 r Answer: B) i > r<\/p>\n

Question 4.
\nDuring refraction …………….. at the interface of two media.
\nA) the speed of light does not change
\nB) the speed of light changes
\nC) frequency of light changes
\nD) All
\nAnswer:
\nB) the speed of light changes<\/p>\n

Question 5.
\nStatement x: When light ray travels from a rarer medium to denser medium the refracted ray bends towards normal.
\nStatement y: When light ray travels from a rarer medium to denser medium the angle of refraction is less than the angle of incidence.
\nA) x and y are true
\nB) x and y are false
\nC) x is true, y is false
\nD) x is false, y is true
\nAnswer:
\nA) x and y are true<\/p>\n

Question 6.
\nThe extent of the change in direction that takes place when a light ray propagates through one medium to another medium is called ……………..
\nA) Refraction
\nB) Refractive index
\nC) Total internal reflection
\nD) None
\nAnswer:
\nB) Refractive index<\/p>\n

Question 7.
\nThe speed of light in vacuum is ……………………
\nA) 3, 00, 000 kms-1<\/sup>
\nB) 3 \u00d7 105<\/sup> kms-1<\/sup>
\nC) 3 \u00d7 108<\/sup> ms-1<\/sup>
\nD) all
\nAnswer:
\nD) all<\/p>\n

Question 8.
\nThe ratio of speed of light in vacuum to speed of light in that medium is called …………………
\nA) critical angle
\nB) refractive index
\nC) absolute refractive index
\nD) both B and C
\nAnswer:
\nD) both B and C<\/p>\n

Question 9.
\nStatement x: Refractive index gives us an idea of how fast or how slow light travels in a medium.
\nStatement y: The speed .of light in a medium is low, when refractive index of medium is high.
\nA) x and y are true
\nB) x and y are false
\nC) x is true, y is false
\nD) x is false, y is true
\nAnswer:
\nA) x and y are true<\/p>\n

\"AP<\/p>\n

Question 10.
\nAbsolute refractive index n =
\nA) \\(\\frac{c}{\\mathrm{v}}\\)
\nB) \\(\\frac{v}{\\mathrm{c}}\\)
\nC) v \u00d7 c
\nD) v \u00f7 c
\nAnswer:
\nA) \\(\\frac{c}{\\mathrm{v}}\\)<\/p>\n

Question 11.
\nMatch the following.<\/p>\n\n\n\n\n\n\n\n
Material medium<\/span><\/td>\nRefractive index<\/span><\/td>\n<\/tr>\n
a) Air<\/td>\np) 1.44<\/td>\n<\/tr>\n
b) Ice<\/td>\nq) 1.33<\/td>\n<\/tr>\n
c) Water<\/td>\nr) 131<\/td>\n<\/tr>\n
d) Kerosene<\/td>\ns) 1. 0003<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

A) a \u2192 p,b \u2192 q,c \u2192 r,d \u2192 s
\nB) a \u2192 q,b \u2192 r,c \u2192 s,d \u2192 p
\nC) a \u2192 s,b \u2192 r,c \u2192 p,d \u2192 q
\nD) a \u2192 s,b \u2192 r,c \u2192 q,d \u2192 p
\nAnswer:
\nD) a \u2192 s,b \u2192 r,c \u2192 q,d \u2192 p<\/p>\n

Question 12.
\nThe refractive index of diamond is………………..
\nA) 2. 42
\nB) 24. 4
\nC) 1
\nD) 1. 42
\nAnswer:
\nA) 2. 42<\/p>\n

Question 13.
\nStatement x: The refractive index of the kerosene is greater than the refractive index of water.
\nStatement y: An optically denser medium may not possess greater mass density.
\nA) both x and y are true
\nB) both x and y are false
\nC) x is true, y is false
\nD) x is false, y is true
\nAnswer:
\nA) both x and y are true<\/p>\n

Question 14.
\nWhich of the following is a dimension less quantity?
\nA) Refractive index
\nB) Relative refractive index
\nC) Both A and B
\nD) Speed of light
\nAnswer:
\nC) Both A and B<\/p>\n

Question 15.
\nIf the refractive index of glass is \\(\\frac{3}{2}\\) then the speed of light in glass is
\nA) 3 \u00d7 108<\/sup> ms-1<\/sup>
\nB) 2 \u00d7 108<\/sup> ms-1<\/sup>
\nC) \\(\\frac{9}{2}\\) \u00d7 108<\/sup> ms-1<\/sup>
\nD) \\(\\frac{3}{2}\\)
\nAnswer:
\nB) 2 \u00d7 108<\/sup> ms-1<\/sup><\/p>\n

Question 16.
\nRefractive index of a medium depends on ………………..
\nA) nature of material
\nB) wavelength of light
\nC) both A and B
\nD) neither A nor B
\nAnswer:
\nC) both A and B<\/p>\n

\"AP<\/p>\n

Question 17.
\nWhen light is going from one medium (other than vacuum or air) to another medium then the value of refractive index is called ……………..
\nA) absolute refractive index
\nB) relative refractive index
\nC) both A and B
\nD) neither A nor B
\nAnswer:
\nB) relative refractive index<\/p>\n

Question 18.
\nThe ratio of speed of light in first medium to speed of light in second medium is called …………………..
\nA) absolute refractive index of first medium
\nB) refractive index of 2nd<\/sup> medium with respect to 1st<\/sup> medium
\nC) refractive index of 1st<\/sup> medium with respect to 2nd<\/sup> medium
\nD) all of the above
\nAnswer:
\nB) refractive index of 2nd<\/sup> medium with respect to 1st<\/sup> medium<\/p>\n

Question 19.
\nRelative refractive index n21<\/sub> = ………………
\nA) \\(\\frac{n_{2}}{n_{1}}=\\frac{v_{1}}{v_{2}}\\)
\nB) \\(\\frac{\\mathrm{n}_{2}}{\\mathrm{n}_{1}}=\\frac{\\mathrm{v}_{2}}{\\mathrm{v}_{1}}\\)\\frac{n_{1}}{n_{2}}=\\frac{v_{1}}{v_{2}}
\nC) \\(\\frac{n_{1}}{n_{2}}=\\frac{v_{1}}{v_{2}}\\)
\nD) \\(\\frac{\\mathrm{c}}{\\mathrm{v}}\\)
\nAnswer:
\nA) \\(\\frac{n_{2}}{n_{1}}=\\frac{v_{1}}{v_{2}}\\)<\/p>\n

Question 20.
\nWhich of the following is Snell’s law ?
\nA) n1<\/sub> sin i = sin r\/n2<\/sub>
\nB) n1<\/sub>\/n2<\/sub> = sin r\/sin i
\nC) n2<\/sub>\/n1<\/sub> = sin r\/sin i
\nD) n2<\/sub> sin i = constant
\nAnswer:
\nB) n1<\/sub>\/n2<\/sub> = sin r\/sin i<\/p>\n

Question 21.
\nRefractive index of glass relative to water is 9\/8. The refractive index of water relative to glass is …………………
\nA) 8
\nB) 1.33
\nC) 1.5
\nD) 8\/9
\nAnswer:
\nD) 8\/9<\/p>\n

Question 22.
\nDuring refraction light follows ………………………..
\nA) Snell’s law
\nB) Archimedes law
\nC) Pascal’s law
\nD) Galilio’s law
\nAnswer:
\nA) Snell’s law<\/p>\n

Question 23.
\nWhich of the following effect is not related to refraction ?
\nA) A coin kept at a bottom of vessel filled with water appears to be raised
\nB) A lemon kept in a glass of water appears to bigger than its size
\nC) A thick glass slab is placed over some printed letters, they appear raised when viewed through glass slab.
\nD) Formation of shadows.
\nAnswer:
\nA) A coin kept at a bottom of vessel filled with water appears to be raised<\/p>\n

Question 24.
\nWhich of the following effect is not related to refraction ?
\nA) A pencil held obliquely and partly immersed in water appears to be bent at the water surface.
\nB) A pool of water appears to be less deep than it actually is.
\nC) The images formed by spherical mirrors.
\nD) The stars appear to twinkle on a clear night.
\nAnswer:
\nC) The images formed by spherical mirrors.<\/p>\n

\"AP<\/p>\n

Question 25.
\nWhich of the following diagram shows the ray of light refracted correctly ?
\n\"AP
\nAnswer:
\n\"AP<\/p>\n

Question 26.
\nThe refractive indices of four substances P, Q, R and S are 1.50,1.36,1.77 and 1.31 respectively. The speed of light is the minimum in the substance.
\nA) S
\nB) R
\nC) Q
\nD) P
\nAnswer:
\nB) R<\/p>\n

Question 27.
\nThe refractive indices of four materials P, Q, R and S are 1.33,1.31,1.44 and 1.52 respectively. When the light rays pass from air into these materials, they refract the maximum in …………………
\nA) P
\nB) Q
\nC) R
\nD) S
\nAnswer:
\nD) S<\/p>\n

Question 28.
\nThe refractive index of glass for light going from aif\u2019to glass is \\(\\frac{3}{2}\\). The refractive index of air for light going from glass to air ………………….
\nA) 1
\nB) \\(\\frac{3}{2}\\)
\nC) \\(\\frac{4}{6}\\)
\nD) \\(\\frac{5}{2}\\)
\nAnswer:
\nC) \\(\\frac{4}{6}\\)<\/p>\n

Question 29.
\nThe refractive index of glass with respect to air is \\(\\frac{3}{2}\\) and the refractive
\nindex of water with respect to air is \\(\\frac{3}{2}\\) . The refractive index of glass with
\nrespect to-water will be
\nA) \\(\\frac{3}{2}\\)
\nB) \\(\\frac{3}{4}\\)
\nC) \\(\\frac{9}{8}\\)
\nD) \\(\\frac{8}{9}\\)
\nAnswer:
\nC) \\(\\frac{9}{8}\\)<\/p>\n

Question 30.
\nA light ray incident on curved surface travelling from rarer medium to denser medium bends ………………….. the normal.
\nA) towards
\nB) away from
\nC) parallel to
\nD) none
\nAnswer:
\nA) towards<\/p>\n

Question 31.
\nIf i and r be the angles of incidence and refraction respectively, when the light ray travels from glass to air, then
\nA) i = r
\nB) i >r
\nC) i < r
\nD) none
\nAnswer:
\nC) i < r<\/p>\n

\"AP<\/p>\n

Question 32.
\nIf the refractive index of transparent material is \\(\\frac{3}{2}\\)the speed of light in that
\nmedium (in ip\/s) is ……………………..
\nA) 4.5 \u00d7 108<\/sup>
\nB) 4.5 \u00d7 1010<\/sup>
\nC) 2 \u00d7 108<\/sup>
\nD) 2 \u00d7 1010<\/sup>
\nAnswer:
\nC) 2 \u00d7 108<\/sup><\/p>\n

Question 33.
\nWhen light enters from air to a medium “X” its speed becomes 2 Answer: 108<\/sup> ms-1<\/sup>, then refractive index of the medium ‘X’ is …………………
\nA) 2
\nB) 3
\nC) 1.5
\nD) 1
\nAnswer:
\nC) 1.5<\/p>\n

Question 34.
\nIf n is the refractive index of a medium and v is the velocity of light in that medium, then which one of the following statements is correct ?
\nA) If n is low, v is low
\nB) If n is high, v is low
\nC) n = v for all media
\nD) n and v are independent of each other
\nAnswer:
\nB) If n is high, v is low<\/p>\n

Question 35.
\nThe angle of refraction of a light ray is the angle between …………………
\nA) incident ray and refracted ray
\nB) refracted ray and interface separating the two media
\nC) normal ray and incident ray
\nD) normal ray and refracted ray
\nAnswer:
\nD) normal ray and refracted ray<\/p>\n

Question 36.
\nThe extent of the change in the direction that takes place when a light ray travels from one medium to another is given by………………..
\nA) critical angle
\nB) focal length
\nC) refractive index
\nD) focal power
\nAnswer:
\nC) refractive index<\/p>\n

Question 37.
\nThe refractive index of a material is 1. If the speed of light in vacuum is 3 \u00d7 108<\/sup> ms-1<\/sup> then the speed of light in that material is ………………..
\nA) 0.3 \u00d7 108<\/sup> m\/s
\nB) 3 \u00d7 108<\/sup> m\/s
\nC) 4 \u00d7 108<\/sup> m\/s
\nD) 108<\/sup> m\/s
\nAnswer:
\nB) 3 \u00d7 108<\/sup> m\/s<\/p>\n

Question 38.
\nSpeed of light is almost half of the vacuum in which of the following ?
\nA) Air
\nB) Water
\nC) Glass
\nD) Kerosene
\nAnswer:
\nC) Glass<\/p>\n

\"AP<\/p>\n

Question 39.
\nKerosene is optically ………………than water
\nA) rarer
\nB) denser
\nC) dilute
\nD) higher
\nAnswer:
\nB) denser<\/p>\n

Question 40.
\nIn which of the following case a light ray does not deviate from its path at the interface of two media ?
\nA) It is incident normally
\nB) Refractive indices of two media is same
\nC) It is incident obliquely
\nD) Both A and B
\nAnswer:
\nD) Both A and B<\/p>\n

Question 41.
\nA diamond shines more than a glass piece cut to the same shape due to………..
\na) refractive index of the diamond is high than the glass piece
\nb) critical angle of diamond is low than the glass piece
\nc) critical angle of diamond is high than the glass piece
\nd) refractive index of the diamond is low than the glass piece
\nA) a and b
\nB) c and d
\nC) a and c
\nD) b and d
\nAnswer:
\nA) a and b<\/p>\n

Question 42.
\nRamu poured some glycerine into the glass vessel and then poured water up to the brim. He kept the quartz glass red into the vessel while doing an activity. When he see the glass rod from the sides of the glass vessel, he can see the ………………….
\nA) only submerged part of the glass rod into the glycerine
\nB) only submerged part of the glass rod into the water
\nC) total length of the glass rod into the vessel
\nD) none
\nAnswer:
\nB) only submerged part of the glass rod into the water<\/p>\n

Question 43.
\nnair<\/sub> = 1, c = 30\u00b0 (glass – air) the n for glass is ………………………
\nA) 0
\nB) 1
\nC) 2
\nD) 3
\nAnswer:
\nC) 2<\/p>\n

Question 44.
\nSpeed of light in a medium is ………………. than in vacuum.
\nA) less
\nB) greater
\nC) equal
\nD) none
\nAnswer:
\nA) less<\/p>\n

Question 45.
\nSpeed of light in vacuum is “c” and n = 3\/2 then the speed of light in medium is ………………….
\nA) \\(\\frac{3 c}{2}\\)
\nB) \\(\\frac{2 c}{3}\\)
\nC) \\(\\frac{5 c}{7}\\)
\nD) \\(\\frac{7 c}{5}\\)
\nAnswer:
\nB) \\(\\frac{2 c}{3}\\)<\/p>\n

Question 46.
\nRefractive index of Benzene is …………………….
\nA) 1.53
\nB) 1.50
\nC) 1.47
\nD) 1.63
\nAnswer:
\nB) 1.50<\/p>\n

\"AP<\/p>\n

Question 47.
\nFind the refractive index of the medium from the figure.
\n\"AP
\nA) 2
\nB) 1.414
\nC) \\(\\frac{1}{2 \\sqrt{2}}\\)
\nD) \\(\\frac{1}{\\sqrt{2}}\\)
\nAnswer:
\nB) 1.414<\/p>\n

CONCEPT – II : Total Internal Reflection<\/span><\/p>\n

Question 48.
\nWhen the angle of incidence is greater than the critical angle the light ray is ! reflected into denser medium at inter face. This phenomenon is called ………………….
\nA) critical angle
\nB) reflection
\nC) refraction
\nD) total internal reflection
\nAnswer:
\nD) total internal reflection<\/p>\n

Question 49.
\nAt critical angle of incidence the angle of refraction is ……………………..
\nA) 0\u00b0
\nB) 90\u00b0
\nC) 45\u00b0
\nD) 180\u00b0
\nAnswer:
\nB) 90\u00b0<\/p>\n

Question 50.
\nTotal internal reflection takes place when the light ray travels from ………………………..
\nA) rarer to denser medium
\nB) rarer to rarer medium
\nC) denser to rarer medium
\nD) denser to denser medium
\nAnswer:
\nC) denser to rarer medium<\/p>\n

Question 51.
\nThe angle of incidence at which the light ray travels from denser to rarer medium grazes the interface is called ……………………….
\nA) refracted angle
\nB) reflected angle
\nC) critical angle
\nD) supplementary angle
\nAnswer:
\nC) critical angle<\/p>\n

Question 52.
\nWhich of the following conditions are needed to take “Total Internal Reflection”?
\na) Light rays travel front denser to rarer medium
\nb) Light rays travel fromrarer to denser medium
\nc) Angle of incidence is greater than critical angle
\nd) Angle of incidence is smaller than < critical angle
\nA) only (a)
\nB) (a) and (c)
\nC) (b) and (d)
\nD) (a) and (d) Answer:
\nB) (a) and (c)<\/p>\n

Question 53.
\nStatement x : Refractive index of air increases with height.
\nStatement y : Cooler air has greater refractive index than , hotter air.
\nA) x is true, y is false
\nB) x is false, y is true
\nC) Both are true
\nD) Both are false
\nAnswer:
\nC) Both are true<\/p>\n

\"AP<\/p>\n

Question 54.
\nStatement x : If the temperature of air increases, the refractive index of air decreases.
\nStatement y : The refractive index of air does not depend on its temperature
\nA) Both are true
\nB) Both are false
\nC) x is true, y is false
\nD) x is false, y is true
\nAnswer:
\nA) Both are true<\/p>\n

Question 55.
\nThe value of refractive index of a rock salt is ………………
\nA) 2. 52
\nB) 1.54
\nC) 2. 62
\nD) 1.42
\nAnswer:
\nB) 1.54<\/p>\n

Question 56.
\nThe critical angle of a diamond is ……………..
\nA) 24.4\u00b0
\nB) 42.4\u00b0
\nC) 14.4\u00b0
\nD) 2.42\u00b0
\nAnswer:
\nA) 24.4\u00b0<\/p>\n

Question 57.
\nWhich one of the following is not an application of total internal reflection ?
\nA) Shining of diamond
\nB) Optical fibre
\nC) Mirage
\nD) Blue colour of sky
\nAnswer:
\nD) Blue colour of sky<\/p>\n

Question 58.
\nIn what condition ray grazes along die surface?
\nA) \u2220i > \u2220c
\nB) \u2220i = \u2220c
\nC) \u2220i < \u2220c
\nD) \u2220i = 0
\nAnswer:
\nB) \u2220i = \u2220c<\/p>\n

Question 59.
\nA ball coated with lamp black put in a glass tank containing water appears shining due to …………………
\nA) refraction
\nB) diffraction
\nC) interference
\nD) total internal reflection
\nAnswer:
\nD) total internal reflection<\/p>\n

Question 60.
\nThe refractive index and the critical angle of a medium are n and c respectively then
\nA) n = c
\nB) n = sin c
\nC) n = \\(\\frac{1}{\\sin c}\\)
\nD) n = \\(\\frac{1}{\\mathrm{c}}\\)
\nAnswer:
\nC) n = \\(\\frac{1}{\\sin c}\\)<\/p>\n

\"AP<\/p>\n

Question 61.
\nThe absolute refractive index of water is. \\(\\frac{4}{3}\\). The critical angle of water is
\nA) sinc = \\(\\frac{4}{3}\\)
\nB) c = sin-1<\/sup>( \\(\\frac{4}{3}\\))
\nC) c = sin-1<\/sup> (\\(\\frac{3}{4}\\))
\nD) 0\u00b0
\nAnswer:
\nC) c = sin-1<\/sup> (\\(\\frac{3}{4}\\))<\/p>\n

Question 62.
\nThe absolute refractive index of a medium is 2. The critical angle for that medium ……………….
\nA) sin-1<\/sup> = (\\(\\frac{1}{3}\\))
\nB) sin-1<\/sup> (2\/3)
\nC) sin-1<\/sup>(\\(\\frac{1}{2}\\))
\nD) sin-1<\/sup>(3\/2)
\nAnswer:
\nC) sin-1<\/sup>(\\(\\frac{1}{2}\\))<\/p>\n

Question 63.
\nStatement X: If angle of incidence is less than critical angle refraction takes place.
\nStatement Y: If angle of incidence is greater than critical angle refraction does not take place. (AS 2)
\nA) Both statements are true
\nB) Both statements are false
\nC) Statement – X is true, statement – Y is false
\nD) Statement – X is false, statement – Y is true
\nAnswer:
\nA) Both statements are true<\/p>\n

Question 64.
\nAs temperature of medium increases, the critical angle ………………..
\nA) increases
\nB) decreases
\nC) remains same
\nD) first increases then decreases
\nAnswer:
\nA) increases<\/p>\n

Question 65.
\nThe refractive index of a material is 2, then the critical angle is ……………………..
\nA) sin-1<\/sup>(2)
\nB) sin-1<\/sup>(\\(\\frac{1}{2}\\))
\nC) sin-1<\/sup>(\u221a2)
\nD) sin-1<\/sup>(\\(\\frac{1}{\\sqrt{2}}\\))
\nAnswer:
\nB) sin-1<\/sup>(\\(\\frac{1}{2}\\))<\/p>\n

Question 66.
\nThe total internal reflection in a diamond makes it shine, because the critical angle of diamond is ……………….
\nA) very low
\nB) very high
\nC) exactly 45\u00b0
\nD) none
\nAnswer:
\nA) very low<\/p>\n

Question 67.
\nThe main principle behind working of optical fibres is …………………..
\nA) total internal reflection
\nB) dispersion
\nC) refraction
\nD) reflection
\nAnswer:
\nA) total internal reflection<\/p>\n

\"AP<\/p>\n

Question 68.
\nChoose the correct increasing order of substances water, ice, kerosene arranged based on their refractive index ………………….
\nA) ice, water, kerosene
\nB) ice, kerosene, water
\nC) water, ice, kerosene
\nD) water, kerosene, ice
\nAnswer:
\nA) ice, water, kerosene<\/p>\n

Question 69.
\nIf n1<\/sub> and n2<\/sub> be the refractive Indices of denser ancfrarer media respectively and 1 c is the critical angle, then ………………..
\nA) sin c = \\(\\frac{n_{1}}{n_{2}}\\)
\nB) sin c = \\(\\frac{n_{2}}{n_{1}}\\)
\nC) sin c = \\(\\sqrt{\\mathrm{n}_{2} \/ \\mathrm{n}_{1}}\\)
\nD) sin c = \\(\\sqrt{\\mathrm{n}_{1} \/ \\mathrm{n}_{2}}\\)
\nAnswer:
\nB) sin c = \\(\\frac{n_{2}}{n_{1}}\\)<\/p>\n

Question 70.
\nA bunch of optical fibres causes a ……………………..
\nA) mirage
\nB) light pipe
\nC) cable
\nD) telescope
\nAnswer:
\nB) light pipe<\/p>\n

Question 71.
\nRefractive index of medium is directly proportional to ………………..
\nA) mass density of the medium
\nB) optical density of the medium
\nC) frequency of the light ray
\nD) all the above
\nAnswer:
\nB) optical density of the medium<\/p>\n

Question 72.
\nTo see internal organs of the human body optical fibres are used in ……………….
\nA) physiotherapy
\nB) radiography
\nC) endoscopy
\nD) microscopy
\nAnswer:
\nC) endoscopy<\/p>\n

Question 73.
\nIf critical angle of the medium is 60\u00b0, then the velocity of that medium is …………………..m\/s
\nA) \\(\\frac{3}{2}\\) \u00d7 108<\/sup>
\nB) \\(\\frac{3 \\sqrt{3}}{2}\\) \u00d7 108<\/sup>
\nC) \\(\\frac{2}{3}\\) \u00d7 108<\/sup>
\nD) 2\u221a3 \u00d7 108<\/sup>
\nAnswer:
\nA) \\(\\frac{3}{2}\\) \u00d7 108<\/sup><\/p>\n

Question 74.
\nRelation between critical angles of water and glass is ………………..
\nA) cw<\/sub> < cg<\/sub>
\nB) cw<\/sub> = cg<\/sub>
\nC) cw<\/sub> > cg<\/sub>
\nD) Done
\nAnswer:
\nC) cw<\/sub> > cg<\/sub><\/p>\n

\"AP<\/p>\n

CONCEPT – III : Refraction Through A Glass slab<\/span><\/p>\n

Question 75.
\nThe light ray that falls perpendicular to one side of the glass slab surface comes out……………………..
\nA) with deviation
\nB) without any deviation
\nC) both A and B
\nD) can’t say
\nAnswer:
\nB) without any deviation<\/p>\n

Question 76.
\nWhen a glass slab is introduced in the path of a light ray the number of times the light ray undergoes refraction are ……………….
\nA) 2 times
\nB) 3 times
\nC) 4 times
\nD) 1 time
\nAnswer:
\nA) 2 times<\/p>\n

Question 77.
\nRefractive index of the glass slab =
\nA) \\(\\frac{\\text { Thickness of the glass slab }}{\\text { Vertical shift }}\\)
\nB) \\(\\frac{\\text { Thickness of the glass slab }}{\\text { Lateral shift }}\\)
\nC) \\(\\frac{\\text { Thickness of the glass slab }}{\\text { Thickness of the glass slab – verticalshift }}\\)
\nD) \\(\\frac{\\text { Thickness of the glass slab }}{\\text { Thickness of the slab – lateral shift }}\\)
\nAnswer:
\nC) \\(\\frac{\\text { Thickness of the glass slab }}{\\text { Thickness of the glass slab – verticalshift }}\\)<\/p>\n

Question 78.
\nThe lateral displacement depends on ………………….
\nA) angle of incidence
\nB) thickness of the slab
\nC) both A and B
\nD) none
\nAnswer:
\nC) both A and B<\/p>\n

Question 79.
\nThe angle between emergent ray and normal is called ………………
\nA) angle of incidence
\nB) angle of refraction
\nC) angle of emergence
\nD) normal
\nAnswer:
\nC) angle of emergence<\/p>\n

Question 80.
\nThe perpendicular distance between the extended emergent ray and incident ray which are parallel is called
\nA) lateral shift
\nB) lateral image
\nC) object distance
\nD) none
\nAnswer:
\nA) lateral shift<\/p>\n

Question 81.
\nThe lateral displacement between the incident and the emergent rays ………………… when the angle of incidence increases.
\nA) increases
\nB) decreases
\nC) remains same
\nD) does not depend on angle of incidence
\nA) lateral shift
\nAnswer:
\nA) increases<\/p>\n

\"AP<\/p>\n

Question 82.
\nThe lateral displacement between the incident and the emergent rays …………….., when the thickness of the glass slab increases
\nA) increases
\nB) decreases.
\nC) remains-same
\nD) none
\nAnswer:
\nA) increases<\/p>\n

Question 83.
\nThe angle of deviation produced by the glass slab
\nA) 0\u00b0
\nB) 20\u00b0
\nC) 90\u00b0
\nD) depends on the angle formed by the light ray and normal to the slab
\nAnswer:
\nA) 0\u00b0<\/p>\n

Question 84.
\nThickness of a glass slab is 3 cm and its refractive index is 2, then its vertical
\nshift is…………………
\nA) 1.5
\nB) 3.5
\nC) 2.5
\nD) 2
\nAnswer:
\nA) 1.5<\/p>\n

Question 85.
\nThickness of a glass slab is 3 cm and vertical shift is 1.5, then its refractive index is ……………………..
\nA) 3
\nB) 2
\nC) 1.5
\nD) 2.5
\nAnswer:
\nB) 2<\/p>\n

Question 86.
\nThe net deviation produced by a rectangular glass slab is …………………..
\nA) equal to angle of incidence
\nB) greater than angle of incidence
\nC) less than angle of incidence
\nD) zero always
\nAnswer:
\nD) zero always<\/p>\n

Question 87.
\nRaju is doing an experiment with the glass slab. He focussed the light towards the glass slab at an angle 30\u00b0. What would be tire angle of emergence?
\nA) 30\u00b0
\nB) 0\u00b0
\nC) 90\u00b0
\nD) >30\u00b0
\nAnswer:
\nA) 30\u00b0<\/p>\n

\"AP<\/p>\n

Question 88.
\nIn the diagram, identify the angles which are correctly marked ?
\n\"AP
\nA) \u2220i and \u2220r
\nB) \u2220r and \u2220e
\nC) \u2220r and \u2220e
\nD) \u2220i, \u2220r and \u2220e
\nAnswer:
\nA) \u2220i and \u2220r<\/p>\n

Question 89.
\nWhich of the following is correct from Hie above diagram ?
\nA) \u2220i > \u2220r
\nB) \u2220r < \u2220i
\nC) \u2220i = \u2220e
\nD) all
\nAnswer:
\nD) all<\/p>\n

Question 90.
\nIf the incident ray falls normally on the surface of a glass slab then trace out the correct diagram ?
\n\"AP
\nAnswer:
\n\"AP<\/p>\n

Question 91
\nA ray of light falls normally on a glass slab. What is the angle of refraction ?
\nA) 0\u00b0
\nB) 90\u00b0
\nC) 45\u00b0
\nD) 180\u00b0
\nAnswer:
\nA) 0\u00b0<\/p>\n

Question 92.
\nA ray of light falls normally on a glass slab. What is the angle of emergence ?
\nA) 0\u00b0
\nB) 90\u00b0
\nC) 45\u00b0
\nD) 180\u00b0
\nAnswer:
\nA) 0\u00b0<\/p>\n

Question 93.
\nA ray of light falls obliquely on a glass slab. What is the angle of emergence ?
\nA) Greater than incident angle
\nB) Less than incident angle
\nC) Equal to incident angle
\nD) 0\u00b0
\nAnswer:
\nC) Equal to incident angle<\/p>\n

Question 94.
\nWhen a ray of light travels through glass slab. Which of the following is not true when it is incidentobliquely ?
\nA) Light ray bends towards the normal when it travels from air to glass.
\nB) Light ray bends away from the normal when it travels from glass to air
\nC) Incident ray and emergent ray lie along the same straight line.
\nD) Incident ray and emergent ray are not along the same straight line.
\nAnswer:
\nD) Incident ray and emergent ray are not along the same straight line.<\/p>\n

\"AP<\/p>\n

Question 95.
\nRamu placed a rectangular glass slab over printed letters. The letters appears while ………………. viewing through a glass slab.
\nA) away from its original position
\nB) nearer as its original position
\nC) as its original position
\nD) both A and B
\nAnswer:
\nB) nearer as its original position<\/p>\n

Question 96.
\nIf the thickness\u2019 of the glass slab increases then the refractive index of the glass slab …………………
\nA) decreases
\nB) increases
\nC) remains same
\nD) none
\nAnswer:
\nC) remains same<\/p>\n

Question 97.
\nIf the vertical shiff produced by the glass slab increases then the refractive index of the glass slab ………………………
\nA) decreases
\nB) increases
\nC) remains same
\nD) none
\nAnswer:
\nC) remains same<\/p>\n

Question 98.
\nWhen the object is in denser medium\u2019 and the observer is in rarer medium, the object should appear …………………..
\nA) closer than the original position
\nB) away from its original position
\nC) as its original position
\nD) both A and B
\nAnswer:
\nA) closer than the original position<\/p>\n

Question 99.
\nShortest distance between incident and emergent ray is …………… of the glass slab.
\nA) Vertical shift
\nB) Lateral shift
\nC) Parallel shift
\nD) Real shift’
\nAnswer:
\nB) Lateral shift<\/p>\n","protected":false},"excerpt":{"rendered":"

Practice the AP 10th Class Physical Science Bits with Answers Chapter 3 Refraction of Light at Plane Surfaces on a regular basis so that you can attempt exams with utmost confidence. AP State Syllabus 10th Class Physical Science Bits 3rd Lesson Refraction of Light at Plane Surfaces with Answers CONCEPT – I : Refraction – …<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[12],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/posts\/15975"}],"collection":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/comments?post=15975"}],"version-history":[{"count":0,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/posts\/15975\/revisions"}],"wp:attachment":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/media?parent=15975"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/categories?post=15975"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/tags?post=15975"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}