Question: A helium-neon laser, radiating at 632.8 nm, has a power output of 3.0mW. The beam diverges (spreads) at angle θ = 0.17mrad (Figure). (a) What

A helium-neon laser, radiating at 632.8 nm, has a power output of 3.0mW. The beam diverges (spreads) at angle θ = 0.17mrad (Figure).

(a) What is the intensity of the beam 40 m from the laser?

(b) What is the power of a point source providing that intensity at that distance?


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