A ray of light is incident normally on one of the refracting surfaces of a prism of refracting angle 60⁰. The emergent ray grazes the other refracting surface. Find the refractive index of the material of the prism.

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1.155

1.75

1.25

1.00

answer is A.

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Detailed Solution

$\begin{array}{l} i, = 0, r_{1} = 0, r_{2} = C = A; i_{2} = 60^{\circ} \\ μ = \frac{1}{\sin C} = \frac{1}{\sin A}; μ = \frac{1}{\sin 60^{\circ}} = 1.155 \end{array}$

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