Question

A light ray is incident perpendicular to a face of a ${90}^{\circ }$ prism and is totally internally reflected at the glass – air interface. If the angle of reflection is ${45}^{\circ }$, what can be concluded about the refractive index n?

• A. $n<\frac{1}{\sqrt{2}}$
• B. $n<\sqrt{2}$
• C. $n>\frac{1}{\sqrt{2}}$
• D. $n>\sqrt{2}$

Answer 1

The correct option is D $n>\sqrt{2}$

Us ethe concepts of TIR and critical angle and find the answer to be $n>\sqrt{2}$.
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