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light blue-green: Minus-Red 4: Minus-red filter with substantial UV absorption 44A light blue-green: Minus-Red 5: Complements #12 minus-blue, and #32 minus-green 47 blue tricolor: C5: Used for color separation. Complements #29 and #61 47A light blue: Stage Blue: By removing much light that is not blue, blue and purple objects show a broader ...
"Blue light glasses filter out blue light," says Dr. Craig See, MD, an ophthalmologist at Cleveland Clinic Cole Eye Institute. "They allow the other colors of light to pass through and reach the eye."
An interference filter, dichroic filter, or thin-film filter is an optical filter that reflects some wavelengths (colors) of light and transmits others, with almost no absorption for all wavelengths of interest. An interference filter may be high-pass, low-pass, bandpass, or band-rejection.
Cobalt glass plates are used as an optical filter in flame tests to filter out the undesired strong yellow light emitted by traces of sodium, and expand the ability to see violet and blue hues, [2] similar to didymium glass. However, didymium glasses are superior for this purpose as it absorbs less light other than the Sodium D lines. [3]
The "chelsea" filter was originally devised by Anderson and Payne in 1934 of the Gem testing Laboratory of the London Chamber of Commerce & Industry.The filter was devised with the collaboration of gemmology students of the Chelsea College of Science and Technology where Basil Anderson was an instructor for the Gemmological Association of Great Britain.
Thus a blue filter makes the picture look blue. A blue filter marginally allows more light in the blue wavelength to pass resulting in a slight shift of the color temperature of the photo to a cooler color. Because of this, the term "IR filters" is commonly used to refer to filters that pass infrared light while completely blocking other ...
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