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A comment on Using a solar oven as a radiant refrigerator at night. Parent comment
https://en.m.wikipedia.org/wiki/One-way_mirror
They are not perfect (intensity & wavelength limitations), but they exist.
See also mirages and total internal reflection.
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https://en.m.wikipedia.org/wiki/One-way_mirror
They are not perfect (intensity & wavelength limitations), but they exist.
See also mirages and total internal reflection.