When light passes from one ____ medium to another at an ____, its ____ changes. If it slows down, the angle of refraction is ____. The degree to which light is refracted depends also on its ____. The index of refraction is a ____ that compares the speed of light in a ____ with the speed of light in the ____. The index of refraction is related to the ____ density or ____ of the material.

Refraction

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