Colors of objects in white light

The color of an opaque object depends on colors of light  reflected by it.

An object appears white in day light if it reflects all colors. 

An object appears black if it absorbs light of all colors and does not reflect any color.

An object appears Red in day light if it absorbs all the colors of white light except Red, which it reflects.

An object appears Yellow in day light if it absorbs all colors except Red and green which it reflects. These combine to produce the effect of yellow.

 

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