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I believe you are actually asking the wrong question, if you are referring to a ray of light. From the viewpoint of classical physics (which designates radiation as a wave), there is no comment on the length. Given that radiation travels at the speed of light (c =~ 3*10^8 m/s) the length of a ray could be the duration of the source (in seconds) times the speed of light. However, in quantum mechanics, radiation is composed of discrete particles, called photons. Photons are massless, and there is no comment on the length, or geometry of a photon.

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14y ago

What else can I help you with?