A ray of light is incident on a transparent slab of glass having refractive index3 . A part of incident energy is reflected and the balance amount of energy is refracted into the slab. If the angle between refracted and reflected rays is 90o, what is the angle of deviation of the reflected ray?

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60o

90o

150o

120o

answer is A.

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Detailed Solution

i+r=900⇒r=900−i∴ μ=sin isin r=sin isin900−i=tan i⇒i=tan−1μ=tan−13=600∴Angle of deviation of reflected ray =1800−2i=1800−2×600=600

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