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Q.

For the situations shown in figure, determine the angle by which the mirror should be rotated, so that the light ray will retrace its path after refraction through the prism and reflection from the mirror?

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a

1° ACW

b

1° CW

c

2° ACW

d

2° CW

answer is D.

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Detailed Solution

For light to retrace the path, the light ray falling on the mirror should be along the normal.Deviation produced by prism δ1=(1.5−1)4=2∘CWSo, mirror has to be rotated by 2° in CW direction.
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