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The automatic f-stop mechanism (iris) in your eye is less sensitive to red light than the shorter wavelengths. Therefore, red light provides some illumination, but doesn't trigger your eye to stop...
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#1: Attribution notice removed
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System
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2020-06-03T15:54:19Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/8084 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/