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A ray is incident at an angle of incidence i on one surface of a small angle prism (with angle of prism A) and emerges normally from the opposite surface. If the refractive index of the material of the prism is μ, then the angle of incidence is nearly equal to:

1. 2A/μ
2. μA
3. μA/2
4. A/2μ

Correct answer: μA

Solution

For a small-angle prism, the deviation is minimal, and the ray emerges normally from the second surface. Using the prism formula and approximations for small angles, the angle of incidence is approximately μA.

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