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| Every point on any wave front can be regarded as a new point source of secondary waves. |
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| The bending of a wave around a barrier, such as an obstacle or the edges of an opening. |
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| Having a single color or frequency. |
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| A series of closely spaced parallel slits or grooves that are used to separate colors of light by interference. |
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| The phenomenon where by interference of light waves of mixed frequencies reflected from the top and bottom of thin films produces a spectrum of colors. |
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| As applied to light waves, having a jumbled mixture of frequency, phase, and possibly direction. |
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| As applied to light waves, having identical frequency and identical phase, and traveling in the same direction. Lasers produce coherent light. |
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| An optical instrument that produces a beam of coherent light-that is, having the waves all the same frequency, phase, and direction. |
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| A three-dimensional version of a photograph produced by interference patterns of laser beams. |
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