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General
Easy
Question
A ray of light strikes a plane mirror at an angle of incidence 45° as shown in the figure. After reflection, the ray passes through a prism of refractive index 1.5, whose apex angle is 4°. The angle through which the mirror should be rotated if the total deviation of the ray is to be 90° is :
- 1° clockwise
- 1° anticlockwise
- 2° clockwise
- 2° anticlockwise
The correct answer is: 1° anticlockwise
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