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The Brewsters angle iₑ for an interface should be

1. 30° < iₑ < 45°
2. 45° < iₑ < 90°
3. iₑ = 90°
4. 0° < iₑ < 30°

Correct answer: 45° < iₑ < 90°

Solution

Brewster's angle occurs when the reflected and refracted rays are perpendicular, and it depends on the refractive indices of the media. Typically, it lies between 45° and 90° for most material interfaces.

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