Q.No.108: - What
is meant by total internal reflection?
Ans: - If the
angle of incidence is larger than the critical angle, the sine of the angle of
refraction, as computed by Snell’s law, would have to be greater than unity,
which is impossible. Beyond the critical angle, the ray cannot pass into the
upper material; it is trapped in the lower material and is completely reflected
at the boundary surface. This situation is called “total internal reflection”.
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