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The angle of incidence for a ray of light at a refracting surface of a prism is 45° . The angle of prism is 60°. If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism respectively, are :
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45° , 1 √2 - 30° , √2
- 45° , √2
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30° , 1 √2
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Correct Option: B
Given: Angle of incidence i = 45°
angle of prism, A = 60°;
Angle of minimum deviation, δm = 2i – A = 30°
Refractive index of material of prism.
| μ = | sin |  |  | |||
| 2 | ||||||
| sin A / 2 | ||||||
| = | = | . | = √2 | |||
| sin 30° | √2 | 1 |
