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## Refraction Sample Problems

- A light ray is incident on crown glass (n=1.52) at an angle of 30° to the normal. It is incident from air. What is the angle of refraction?
- A ray of light falls on a lake surfaces at an angle of 35° to the surface of the water (n=1.33). Draw the incident and the reflected rays. Determine the magnitude of the reflected ray. Draw the refracted ray. Determine the magnitude of the refracted ray.
- A light ray passes from air into an unknown substance. The incident angle is 23° and the refracted angle is 14°. What is the index of refraction of the unknown substance?
- The index of refraction of water is 1.33. What is the speed of light in water?
- The speed of light in a substance is 2.56 x 10
^{8}m/s. What is the index of refraction of the substance?
- What is the critical angle for a diamond (n=2.42) to air boundary?
- What is the critical angle for a gemstone whose index of refraction is 1.86?

## Lenses Sample Problems

Describe the image mathematically and using a ray diagram. Find the magnification ratio. Always use a 1 cm high object.

- An object is placed 30 cm in front of a convex lens with a 10 cm focal length.
- An object is placed 10 cm in front of a convex lens with a 6 cm focal length.
- An object is placed 5 cm in front of a convex lens with a 10 cm focal lenght.
- An object is placed 15 cm in front of a concave lens with an 8 cm focal length.
- An object is placed 3 cm in front of a concave lens with a 5 cm focal length.

Lenses and Refraction Notes

Refraction Homework

Lenses Homework