Ratu says if a room is completely dark, then after waiting a while our eyes will adjust and we…
Ratu says if a room is completely dark, then after waiting a while our eyes will adjust and we will be able to see things even with no light at all. Is Ratu right?
Who do you think is right? Pick one.
The answer: No — no light means nothing to see
Why
Ratu's noticed something real — step into a dim room and after a while you DO see more, so it feels like eyes can beat the dark. What's happening is your eyes adjust to a LITTLE light by opening wider to catch it. But adjusting can only gather light that's there; it can't make sight out of nothing. Seeing works one way: light bounces off a thing and enters your eye — no light in, no seeing, however long you wait. A dim room has a little stray light to adapt to; a truly total-dark room has none. Test: your eyes never 'adjust' inside a fully sealed cupboard — it stays pitch black no matter how long you sit. Ratu is not right: eyes adapt to faint light, but with zero light there's nothing for them to catch, so nothing is seen.
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