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A ray of light is incident at an angle of 60° on one face of a prism of angle 30°. The emergent ray of light makes an angle of 30° with incident ray. The angle made by emergent ray with second face of prism will be -

1. 30°
2. 90°
3. 0°
4. 45°

Correct answer: 90°

Solution

The emergent ray makes an angle of 30° with the incident ray, and since the prism has an angle of 30°, the light exits at a right angle to the second face, resulting in an angle of 90° between the emergent ray and the second face.

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