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1. Why does a ray of light bend when it travels from one medium to another?
a. Refraction of light is the beams when they pass obliquely from one medium to another.
b. The difference in of light in different mediums causes this deviation.
2. What is the speed of light in vacuum?
a. is the only medium in which the speed of light equals that of a vacuum.
b. The speed of light is
3. Concave mirrors are used by dentists to examine teeth. Why?
a. A parallel beam of light is directed at the .
b. Concave mirror the light rays.
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