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## Main Question or Discussion Point

Does anyone know where I can find a derivation how/why a light beam disperses? I'd like to see some sort of solution to Maxwell's equations for a finite width EM wave in free space.

If the beam is a linear superposition of frequencies and Maxwell's equations are linear, does a laser beam disperse less than an equivalent beam of normal light?

If the beam is a linear superposition of frequencies and Maxwell's equations are linear, does a laser beam disperse less than an equivalent beam of normal light?