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With a box that has many perfect relective mirrors, would it be possible to trap a beam of light in the box indefinetly?

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marked as duplicate by Qmechanic May 29 '13 at 0:33

This question was marked as an exact duplicate of an existing question.

We have a number of related questions, although I haven't seen a direct duplicate. This one overlaps in the subject material: and I think I asked the same thing in comments in the prior question about optical cavities – Alan Rominger May 29 '13 at 0:08

No, because eventually those photons will escape the box through quantum tunneling.

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