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## Homework Statement

A light ray shines from a diamond (n = 2.42) into water (n = 1.33), and no refraction occurs. What is the angle of incidence?

- 0°

- 30°

- 45°

- 60°

## Homework Equations

sin θc = nr/ni ?

## The Attempt at a Solution

**I thought that by finding the critical angle then anything above that would be the angle of incidence where total internal reflection occurs therefore no refraction? But that would leave two right answers which cannot be the case. Is it actually just zero, and I am thinking about it wrong?**

θi = sin-1 (1.33 sin 90°)/ 2.42 = 33.3 degrees

θi = sin-1 (1.33 sin 90°)/ 2.42 = 33.3 degrees