What effect does only distance travelled have on light?

What effect does only distance travelled have on light?
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Answer :

Light, like any other form of electromagnetic radiation, decreases in intensity the further it travels from the point of emission. The mathematical relation that describes this is an inverse square- that is to say the intensity of the radiation at distance x is proportional to the reciprocal of the square of x. This describes aggregate behavior. An individual photon or a collimated beam (like a laser) does not decay over distance according to the inverse-square relation, but some other.
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