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Yellow filter absorbs blue light.

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  1. Filters are used to regulate the wavelength of the radiation and they are placed in front of the lens. Absorption filters are common (absorption = light being "absorbed" into matter). For example, a yellow filter absorbs the blue color, letting green and red colors through (with lights, green + red = yellow)

  2. Filter is a device that lets through only a part of the information, matter or energy received.

Cf. Optics


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