One of our readers sent the following question:
Let’s deal with together. If we have perfect mirrors at our disposal, i.e. Mirrors, which reflect 100% of the photons falling on them, and that there will be a vacuum between the mirrors, yes, indeed, with this scenario, photons between the mirrors will fly almost forever.
However, in the real world of ideal mirrors does not exist. The better the mirror is alone, the higher its reflection coefficient and the closer it is to the ideal. But for real mirrors consisting of atoms, it is impossible to achieve this, since the roughness at the atomic and molecular level will inevitably be, even if we manage to smooth out all micro and nano roughness.
As a result, part of the photons will be reflected from the surface of the mirrors not at a right angle to the surface of the mirror, which will lead to the scattering and leakage of photons beyond the borders of the pair of mirrors. To date, there are mirrors with a reflection coefficient equal to 99.9999%, however, given the huge speed of light and the small distance between the photons mirrors will stop running even between such mirrors for very small fractions of seconds.
A more efficient trap for photons would be a reflective sphere. Such devices are used to simulate an absolutely black body. Such spheres produce no more than one ten millionth percent of the photons inwards.