1. A ray of light traveling through air is incident upon a sheet of crown glass (n=1.52) at an angle of 30° to the normal. What is the angle of refraction? Ans: 19.2°
2. A ray of light passes into water from air at an angle of 50° to the lake's surface. What is the angle of refraction? What is the speed of light in the water? Ans: 28.9°; 2.25 x 10⁸m/s
3. Calculate the speed of light in a diamond. Ans: 1.24 x 10⁸m/s.
4. A block of unkown material is submerged in water. Light in the water is incident on the surface at an angle of 31°. The angle of refraction is 27°. What is the speed of light in the unknown material? Ans: 1.20 x 10⁸m/s
5. What is the critical angle for light rays passing from diamond (n=2.42) into air? Ans: 24.42°
6. What is the critical angle for light rays passing from quartz (n=1.54) into water (n=1.33)? Ans: 59.73°
7. The critical angle for light rays passing from water into air is 48.75°. What is the index of refraction of water? Ans: 1.33

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Refraction & Lenses Sample Problems

Lenses Homework