= Cold mirror
{wiki=Cold_mirror}
A "cold mirror" is an optical device designed to reflect visible light while allowing infrared (IR) light to pass through. This is particularly useful in applications such as photography, videography, and scientific instrumentation where it's important to separate these wavelengths. Cold mirrors usually consist of a thin layer of metal or a dielectric coating that reflects certain wavelengths while being transparent to others, effectively achieving thermal management by preventing heat buildup from infrared radiation.
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