Many optical telescopes, such as those at Keck Observatory, operate effectively in the near infrared as well as at visible wavelengths.

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Optical radiation, visible, UV, and infrared
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Infrared radiation with wavelengths just longer than visible light, known as near-infrared, behaves in a very similar way to visible light, and can be detected using similar solid state devices ...
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Many optical telescopes, such as those at Keck Observatory, operate effectively in the near infrared as well as at visible wavelengths.
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https://en.wikipedia.org/wiki/Infrared_astronomy
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Infrared radiation with wavelengths just longer than visible light, known as near-infrared, behaves in a very similar way to visible light, and can be detected using similar solid state devices ...
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Optical radiation is part of the electromagnetic spectrum. It is subdivided into ultraviolet radiation (UV), the spectrum of light visible for man (VIS) and infrared radiation (IR). It ranges between wavelengths of 100 nm to 1 mm [DISPUTED]
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