Question

A ray of light is incident on a prism of refractive index as shown in figure.
(a) Find the angle of incidence for which the deviation of light ray by the prism is minimum.
(b) By what angle the second prism must be rotated, so that the final ray suffer net minimum deviation.Β 

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A

,

B

,

C

,

D

None of these

Hard
JEE Mains

Solution

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Correct option is C)

Minimum deviation
and

andΒ 


UsingΒ Snell'sΒ law,





When the prism is rotated anticlockwise by Β the combined prism will become a slab as shown in the figure 2. In this case the net deviation by the prism will be zero as the deviation by the two prism will be equal and opposite.

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