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General
Easy
Question
A ray of light strikes a plane mirror at an angle of incidence 450 as shown in the figure After reflection, the ray passes through a prism of refractive index 1.50, whose apex angle is 40 The angle through which the mirror should be rotated if the total deviation of the ray is to be 900 is
- 10 clockwise
- 10 anticlockwise
- 20 clockwise
- 20 anticlockwise
The correct answer is: 10 anticlockwise
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