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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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[–] • 0 pt

I don't know what "collimated" means. Instead of me relying on Joogle, will you explain its meaning please?

[–] • 1 pt

Lenses, like a flashlight with a narrow beam has.

[+] [deleted] • 1 pt