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| An energy-carrying wave emitted by a vibrating charge (often electrons) that is composed of oscillating electric and magnetic fields that regenerate one another. |
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Definition
| The range of electromagnetic waves extending in frequency from radio waves to gamma rays. |
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| The term applied to materials through which light can pass in straight lines. |
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Definition
| The term applied to materials that absorb light without reemission and thus through which light cannot pass. |
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Definition
| A shaded region that appears where light rays are blocked by an object. |
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Definition
| The darker part of a shadow where all the light is blocked. |
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Definition
| A partial shadow that appears where some but not all of the light is blocked. |
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| An event wherein the Moon blocks light from the Sun and the Moon's shadow falls on part of the Earth. |
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Definition
| An event wherein the Moon passes into the shadow of the Earth. |
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