First slide

Ray optics

Question

If the angle of a prism is 60° and angle of minimum deviation is 40°, then the angle of refraction will be:

Moderate

Solution

$r_{1} + r_{2} = A$
At min. deviation $r_{1} = r_{2} = r$ say
$\begin{array}{l} 2 r = A \\ r = \frac{A}{2} = 30^{0} \end{array}$

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