If a light ray incidents normally on one of the faces of the prism of refractive index '2' and emergent ray just grazes the second face of the prism, then the angle of deviation is

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60⁰

0⁰

30⁰

90⁰

answer is C.

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Detailed Solution

$\begin{array}{l} i_{1} = r_{1} = 0; r = c, i_{2} = 90^{0}; A = r_{1} + r_{2} = c \\ μ = \frac{1}{\sin c} = \frac{1}{\sin A}; A = C = 30^{0} \\ d = i_{1} + i_{2} - A = 90^{\circ} - 30^{\circ} = 60^{\circ} \end{array}$

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