A helium-neon laser, radiating at 632.8 nm, has a power output of 3.0 mW. The beam diverges

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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?

A helium-neon laser, radiating at 632.8 nm, has a power

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Fundamentals of Physics

ISBN: 978-0470469118

9th Edition

Authors: Jearl Walker, Halliday Resnick

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Question Posted: Jan 11, 2012 05:47 AM

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A helium-neon laser, radiating at 632.8 nm, has a power output of 3.0 mW. The beam diverges

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Laser

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a At r 40 m the intens...View the full answer

Fundamentals of Physics

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