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A light ray is incident by grazing one of the face of a prism and after refraction ray does not emerge out, what should be the angle of prism while critical angle is $C$
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The correct answer is:
More than $2 C$
From ray diagram
$A=C+\theta$ for $\operatorname{TIR}$ at $A C$
$\theta\gt C_{\text {so }} A\gt2 C$
$A=C+\theta$ for $\operatorname{TIR}$ at $A C$
$\theta\gt C_{\text {so }} A\gt2 C$
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