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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^@`

1 Answer

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Best answer
Correct Answer - D
image
Critical angle for glass-air
`sqrt2sinC=1xxsin90^@`
`C=45^@`
Since `i=45^@=C`
`r=90^@`

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