Lesson: Chapter 5 — Optics

5.3.1. The laws of refraction 3 of 5 Reset answers

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Question 3

Light enters a medium from air with i = 30° (sin 30° = 0.5) and r = 22° (sin 22° = 0.375). What is the refractive index?

A 1.5 B 1.33 C 1.36 D 0.75

The right answer is the one marked above.

1.33. n = 0.5 ÷ 0.375 = 1.33 — the medium is water.

0.75 comes from dividing the other way round; 1.36 from dividing the angles instead of their sines.

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