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| a narrow beam of light traveling in a straight line |
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| a material in which a light wave travels |
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| a type of wave, such as a light wave or a radio wave, that can travel in a vacuum as well as in various materials |
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| occurs when a wave strikes an object or surface and bounces off |
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| the distance between a point on one wave and an identical point on the next wave, measured from crest to crest or trough to trough |
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| the number of waves that pass a given point in one second |
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| states that the angle of incidence is equal to the angle of reflection |
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| the single point on the optical axis of a mirror or lens |
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| the distance of the focal point from the center of the mirror or lens |
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| the bending of a light wave when it changes speed in moving from one material to another |
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| a transparent object that has at least one curved side that causes light to bend |
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| a lens whose center is thicker than its edges |
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| a lens whose edges are thicker than its middle |
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