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Light ray emerges normally from another surface. Hence, angle of emergence = 0. Which of the following is correct?

1. μ₁ sin i = μ₂ sin r
2. μ₁ cos i = μ₂ cos r
3. μ₁ tan i = μ₂ tan r
4. μ₁ cot i = μ₂ cot r

Correct answer: μ₁ sin i = μ₂ sin r

Solution

The correct relation for refraction at an interface is given by Snell's law: μ₁ sin i = μ₂ sin r. This law governs the relationship between the angles of incidence and refraction for light passing between two media.

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