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A ray of light incident paralled to the base $\mathrm{PQ}$ of an isosceles right-angled triangular prism PQR suffers two successive total internal reflections at the faces $P Q$ and QR before emerging reversed in direction as shown
If the refractive index of the material of the prism is $\mu$, then
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If the refractive index of the material of the prism is $\mu$, then
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Verified Answer
The correct answer is:
$\mu>\sqrt{5}$
also $\begin{array}{ll} & 45+r>C \\ & 45-r>C \\ & 90>C \\ & \because \mu>\sqrt{2}\end{array}$
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