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Q.

When a ray of light is incident on a glass slab at an angle of 60°, the angle between the reflected and refracted rays is 90°. The refractive index of glass is:

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a

1.5

b

2.0

c

3

d

2

answer is C.

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Detailed Solution

Angle of incidence = i, 

angle of refraction, r = 90 –  i. 

Hence, the refractive index is given by: 
μ=sinisinr=sinisin90°-i=sinicosi=tani 

⇒ μ=tan60°=3

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