Why the white light is regarded as a composition of seven colors?

White light is a composition of many more colors than seven. The presence in white light if any color at all can be demonstrated as follows: Mix a chemical dye that absorbs every color of light except the one you want to detect. Saturate a clear, transparent plastic sheet with the dye, and sandwich the sheet between clear layers of glass, forming what is known as an optical "filter Direct a beam of white light at one side of the filter.

Recall that the chemical dye absorbs every color of light except for the narrow band of wavelength which it has been designed to pass Observe that light with the selected wavelength ("color") shines forth from the other side of the filter, demonstrating that it was present in the white light Such filters can actually be constructed, with very narrow "passband.

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