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| light energy that can be seen and can be broken into the colors of the rainbow |
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| the distance from a point on a wave to the same point on the wave |
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| allows light to pass through so that whatever is behind it can be seen |
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| allows light to pass through but scatters it so that whatever is behind it cannot be clearly seen |
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| does not allow light to pass through |
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| a lens that is thicker in the middle than at the edges |
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| a lens that is thinner in the middle than at the edges |
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| to move quickly back and forth |
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| the loudness or softness of a sound |
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| the highness or lowness of a sound |
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