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In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction?

1. 180°
2. 0°
3. equal to angle of incidence
4. 90°

Correct answer: 90°

Solution

When the angle of incidence equals the critical angle, the angle of refraction becomes 90° as the refracted ray grazes along the boundary of the two media.

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