Color vision is the capacity of an organism or machine to distinguish objects based on the wavelength (or frequency) of the light they reflect or emit.
A 'red' apple does not emit red light.
Rather, it simply absorbs all the frequencies of light shining on it except the frequencies we call red, which are reflected.
For more information about the topic Color vision, read the full article at Wikipedia.org, or see the following related articles:
Editor's Note: This article is not intended to provide medical advice, diagnosis or treatment.
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