Snell's Law: Light traveling through water comes to a glass surface at an angle of incidence of 48.5 degrees. If the angle of refraction is 38.5 degrees, what is the index of refraction of the
glass?

1. The best definition of refraction is .

a. passing through a boundary

b. bouncing off a boundary

c. changing speed at a boundary

d. changing direction when crossing a boundary

D

Bouncing off a boundary (choice b) is reflection. Refraction involves passing through a boundary (choice a) and changing speed (choice c); however, a light ray can exhibit both of these behaviors without undergoing refraction (for instance, if it approaches the boundary along the normal). Refraction of light must involve a change in direction; the path must be altered at the boundary.

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