We can “see” light between 380 and 700 nanometers, but what happens at the egde and just after that? I mean, when we approach the limit like 699-700-701-705…
Does it turn completely dark/invisible/something else immediately or is there some kind of gradual change?
Is it the same on both ends?
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> I mean, when we approach the limit like 699-700-701-705…
That is **exactly** what happens when you have a red-hot piece of metal that slowly cools down in an otherwise dark room. First it glows in the visible range, but as it cools down, the light increases in wavelength, until it gradually goes above 700nm and into the infrared range.
And while it still shines brightly in the infrared, to our eyes it looks like the glow slowly disappears into darkness.
It is the same on the other end, except I can’t think of an everyday examplpe of it right now, and also, you would probably suffer from subnurn in that case.
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