The spectrum of reflected light and the color of objects

Find out how the spectrum of light reflected from the surface of colored paper changes with the help of the experimental scheme shown in the figure. Answer the question.

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The color of an object is the color of the light that the object's substance reflects, scatters, or transmits but does not absorb.

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Study of the spectrum of reflected light, scheme

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Why does text written with a red pen disappear when the paper is viewed through a red light filter?

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Color of items