Question

A light ray is incident perpendicular to one face of a 90° prism and is totally internally reflected at the glass-air interface.

Answer 1

Answer:

Explanation:

Answer:        (A) μ > √2

                   For total internal reflection at glass air interface, article at angle C must be

                   less than 45°.

                   also    μ = [1 / (sin c)] where μ is refractive index

                   ∴        μ = [1 / (sin 45)] = [1 / (1 / √2)] = √2

                   This μ is the minimum value, hence μ > √2.    

 

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