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If a cave had 1 mirror at the mouth receiving sun, and a relay of mirrors going down into the cave, how far could the light travel?

Would the mirrors need to heat up to push light further?

If a cave had 1 mirror at the mouth receiving sun, and a relay of mirrors going down into the cave, how far could the light travel? Would the mirrors need to heat up to push light further?

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[–] [deleted] • 1 pt (edited )

Most of the light hitting a mirror is reflected. They warm up a little bit over the day but if you have a well made surface then yeah, whats stopping light from travelling 5 billion miles to earth and then a few miles around a cave? Diffusion/degradtion is your problem. The first mirror will beam a nice amount of light that ideally you'd used to light up an entire cave from the roof.