First slide

Prism

Question

A parallel beam of monochromatic light is incident at one surface of a equilateral prism. Angle of incidence is 55° and angle of emergence is 46°. The angle of minimum deviation will be

Moderate

A

Less than 41°
B

Equal to 41°
C

More than 41°
D

None of the above

Solution

By the hypothesis, we know that
$i_{1} + i_{2} = A + δ \Rightarrow 55^{\circ} + 46^{\circ} = 60^{\circ} + δ \Rightarrow δ = 41^{\circ} But δ_{m} < δ, so δ_{m} < 41^{\circ}$

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