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Q.

If the angle of a prism is 80° and angle of minimum deviation is 45°, then the angle of refraction will be:

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a

25°

b

40°

c

45°

d

30°

answer is A.

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Detailed Solution

$r_{1} + r_{2} = A$

At min. deviation $r_{1} = r_{2} = r$ say

$\begin{array}{l} 2 r = A \\ r = \frac{A}{2} = 40^{0} \end{array}$

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