A helium-neon laser, radiating at 632.8 nm, has a power
Chapter 33, Problem 91(choose chapter or problem)
A helium-neon laser, radiating at 632.8 nm, has a power output of 3.0 m W. The beam diverges (spreads) at angle e = 0.17 mrad (Fig. 33-72). n5 Air (a) What is the intensity of the beam Fig. 33-72 91. 40 m from the laser? (b) What is the power of a point source providing that intensity at that distance?
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