A helium-neon laser radiating at 6328 nm has a power, Physics

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A helium-neon laser radiating at 6328 nm has a power

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

(a) What is the intensity of the beam 36 m from the laser?

W/m2

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

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Physics: A helium-neon laser radiating at 6328 nm has a power

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Physics: A helium-neon laser radiating at 6328 nm has a power

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