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The refractive index of the material of a prism is √2 and its refracting angle is 30°. One of the refracting surfaces of the prism is made a mirror inwards. A beam of monochromatic light enters the prism from the mirror surface if its angle of incidence of the prism is
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- 30°
- 45°
- 60°
- 0°
Correct Option: B
∠r = 30° (using law of triangle) 
| ⇒ µ = | ||
| sin r |
⇒ √2 × sin 30° = sin i
| ⇒ sin i = | ⇒ i = 45° | |
| √2 |
