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| In the particle model of electromagnetic radiation, a particle that travels only at the speed of light and whose energy is related to the frequency of the radiation in the wave model. |
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| The distance light travels through a vacuum during one year. |
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| A wave that is partly electric and partly magnetic and carries energy. Emitted by vibrating electric charges. |
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| The range of electromagnetic waves extending from radio waves to gamma rays. |
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| Electromagnetic waves of frequencies lower than the red of visible light. |
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| Electromagnetic waves of frequencies higher than those of violet light. |
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| Term applied to materials that allow light to pass through them in straight lines. |
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| Term applied to materials that absorb light without reemission, and consequently do not allow light through them. |
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| A shaded region that results when light falls on an object and thus cannot reach into the region of the far side of the object. |
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| The darker part of a shadow where all the light is blocked. |
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| A partial shadow that appears where light from part of the source is blocked and light from another part of the source is not blocked. |
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| The aligning of vibrations in a transverse wave, usually by filtering out waves of other directions. |
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