Overlapping red and blue filters

Overlapping red and blue filters

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Caption: Red and blue filters. Overlapping red and blue colour filters photographed in front of white light. The area of overlap appears completely black. White light consists of a mixture of wave- lengths within the visible spectrum. When white light strikes a colour filter, only a specific wavelength can pass through, such as red or blue. If two colour filters are used at once, however, all wavelengths are excluded, resulting in blackness.

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Keywords: black, colour, colour filter, coloured, filter, filters, light, mix, mixture, optics, physics, red and blue

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