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Why do objects appear the color they are?

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It's a matter of selective absorption and reflection of the varying wavelengths of light. Our eyes and brain work together to interpret the different wavelengths of light as different colors. White light is composed of all possible wavelengths of visible light, and sunlight is very nearly white. Characteristics of various surfaces cause them to reflect or absorb certain wavelengths. The ones that are reflected to our eyes are what determine the color we perceive. To cite just a single example, if a ball is red, it reflects red light and absorbs the other colors. That's why it appears red. The issue is slightly different for a source of light, and the answer speaks to all other things we see and the colors they appear to have.
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When an object appears to be yellow what color of the spectrum is reflected?

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Why do objects appear the color they are in white light?

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Why does an object appear to be black in color?

An object would appear black if:    it did not emit any visible radiation.  it was in an environment where there was no ambient visible  radiation present.  the compo