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In other words: how far it would go? somewhere i read that there's a laser beam that goes to the moon , and is reflected back to earth to measure the distance of the moon , or the speed of light (don't remember which), but does it fade or come in full integrity?
A laser beam is a very narrow beam of light which can have a very small divergence. i.e the angle at which the light spreads out is very small - in many cases so small that all the light that is emitted from the lasers aperture will hit a similar sized target even after many miles. However, there isn't a 'perfectly straight' laser beam, and the light beam does in fact spread out gradually. Additionally, the light will also hit particles ( dust , air turbulance etc ) which will cause further beam disruption. So - although the light will in itself travel on forever, its path ( the path of individual photons ) will ultimately be diverted from a straight line. Therefore any received light from a mirror on the moon will only be a portion of the light actually sent.
Other than that - light doesn't 'fade', we simply see less of it over distance because it spreads out. Out eyes simply see a percentage of the original energy.
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