The filter selectively transmits the red and blue portions of the incident white light spectrum, but absorbs most of the green wavelengths. As discussed in our section on primary colors, the color magenta is obtained by subtracting green from white light. The light-modulating properties of a typical color filter are illustrated in Figure 2.Advertisement Filters are pieces of glass or plastic that you place in the barrel of an eyepiece to restrict the wavelengths of light that come through in the image. 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