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A ray of light travelling inside a recta...

A ray of light travelling inside a rectangular glass block `(mu=sqrt2)` is incident on the glass-air surface at an angle of incidence of `45^@`. The refractive index of air is 1. The ray will

A

emerge into air without any deviation

B

be reflected back into glass

C

be absorbed

D

emerge into air `r=90^@`

Text Solution

Verified by Experts

The correct Answer is:
D

Critical angle for glass-air
`sqrt2sinC=1xxsin90^@`
`C=45^@`
Since `i=45^@=C`
`r=90^@`
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