Sunlight reflection through mirror on wall-in shape of mirror,but reflection of tube light is cylindrical why?

Answer 1

All right, I think what you mean is that if there's a small mirror on the wall, sunlight would cause a patch of light in the shape of the mirror to appear on a wall somewhere, but fluorescent light won't have this effect. The most concise explanation is that the sun is close to being a pinpoint source of light, while interior fluorescent lights are extended light sources. Extended light sources will cause a "blur" of mirror reflections on the wall, so that the shape of the patch of light won't have sharp boundaries. The fact that fluorescent lights are tubular is irrelevant.

What's more, if a single long fluorescent light is the source of light, then you'll see an oblong patch of light. Technically speaking, it'd be the convolution of the shape of the flourescent light source and the shape of the mirror.