# What effect does only distance travelled have on light?

What effect does only distance travelled have on light?

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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