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Question

A ray of light is incident at 60, on glass-air interface. Then the light ray will ___. (Given: Incident ray lies in glass).
Use : [μg = 2 , μa = 1]

A

pass undeviated

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B

reflect back into glass

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C

refract at 90 to the normal

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D

refract at 60 to the normal

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Solution

The correct option is B

reflect back into glass


Given:
Angle of incidence, i=60

Critical angle for the glass air interface is:
C=sin11μw
C=sin112
C=45
i>C

As angle of incidence is greater than the critical angle, total internal reflection occurs. That is, light will reflect back into glass.

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