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