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Why does white light consist of many different wavelengths?

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It doesn't. Light with the colour white can be obtained by mixing only red, green and blue lights. We have 3 types of cones in our eyes. They respond differently according to the wavelength of light. When the response is equal for every cone type, you see gray/white. Light with all wavelengths does that. read more

It doesn't. Light with the colour white can be obtained by mixing only red, green and blue lights. We have 3 types of cones in our eyes. They respond differently according to the wavelength of light. read more

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