What happens if you put two mirrors opposite each other?

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A rather curious question was sent to me in the mail (in the description of the channel):

For two ideal mirrors standing perfectly parallel to each other, there will be no reflection limit, the rays will run endlessly between them.

This is not the case for real mirrors. The first is the absorption of radiation by the surface of the mirrors. Secondly, no matter how well the mirror is polished, it will still have microscopic roughness. This will lead to a slight scattering of the rays to the sides. Therefore, there will be a limited corridor.

If the mirrors are magnifying, then again, the rays will be scattered behind the mirror, and the image will become more and more dark with each subsequent reflection, all the radiation will not disappear here, but it will become extremely weak.

An ideal mirror could increase indefinitely, but for real mirrors there is a limitation associated with the atomic structure of the mirror, there is a magnification limit beyond which all objects will become blurry, and then they will generally merge into one spot.

An ideal reflecting sphere will indeed be a trap for photons; in our time, a completely black body is realized in this way, which does not reflect the light entering the outside at all. In real conditions, less than 0.0000001% of radiation comes out.