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filter (optics) |
Also found in: Wikipedia | 0.03 sec. |
filterIn optics, a device that absorbs some parts of the visible spectrum and transmits others. A beam of white light can be made into a beam of coloured light by placing a transparent colour filter in the path of the beam. For example, a green filter will absorb or block all colours of the spectrum except green, which it allows to pass through. A yellow filter absorbs only light at the blue and violet end of the spectrum, transmitting red, orange, green, and yellow light. |
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| Imprinted white horizontal lines (like blinds) on the outer glass filter the sun's intensity. Clean the glass filter on the reading head monthly using alcohol to remove any oxidation. Window glass filters produce a spectrum that is equivalent to that of sunlight filtered through glass. |
Glass filter
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