A beam of light travelling in water falls on a glass plate immersed in water. When the incident angle is `51^(@)`, the reflected beam of light is found to be completely plane polarised. Determine the refractive index of glass. Given refractive idex of water =4/3.
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A square plate of 0.1 m side moves parallel to a second plate with a velocity of `0.1 m//s`, both plates being immersed in water. If the viscous force
Correct Answer - D `A=(0.1)^(2) = 0.01m^(2),.^ (eta=0.01 "Poise" = 0.001 "decapoise") (M.K.S. "unit")`, `dupsilon = 0.1m//s` and `F = 0.002N` `F=etaA(dv)/(dx) " "therefore dx = (etaAdv)/(F) = (0.001xx0.01xx0.01)/(0.002) = 0.0005m`.
2 Answers 1 views
A parallel beam of light falls normally on the first face of a prism of small refracting angle. At the second refracting face it is partly reflected a
Correct Answer - `mu = 2, A = 1^(@)`
2 Answers 1 views
White light is incident on a soap film at an angle of `sin^(-1(4)/(5))` and the reflected light on examination by the spectroscope shows dark bands. T
Correct Answer - `1.716xx10^(-3)`cm
2 Answers 10 views
A soap film of refractive index 4/3 and thickness `1.5xx10^(-4)`cm is illuminated by white light incident at angle `45^(@)`. The reflected light is ex
Correct Answer - n=7
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A parallel beam of sodium light of wavelength 5896 Å is incident at angle `30^(@)`. Find the minimum thickness of the glass plate for which the transm
Correct Answer - `1.135xx10^(-7)`m
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When sunlight is incident on water at an angle of `53^(@)`, the reflected light is found to be completely plane-polarised. Determine (i) angle of refr
Correct Answer - (i) `37^(@)` (ii) 1.327
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A ray of light is incident on a glass plate of refractive index 1.54. If the reflected ray is completely plane polarised, find (i) angle of incidence
Correct Answer - (i) `57^(@)` (ii) `33^(@)` (iii) `40.5 ^(@)`
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The critical angle for a certain wavelength of light is glass is `40^(@)`. Calculate the polarising angle and the angle of refraction in glass corresp
Correct Answer - `57.3^(@),32.7^(@)`
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A glass plate (n=1.53) that is 0.485 ` mu` m thick and surrounded by air is illuminated by a beam of white light normal to the plate. (a) What wavelen
Correct Answer - `[(a) 424 nm, 594 nm; (b) 495 nm]
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A ray of light is incident on the glass prism at an angle of `40^(@)`. Find the angle of emergence, if the angle of prism is `60^(@)` and refractive i
Correct Answer - `58.5^(@)`
2 Answers 1 views