A hene helium-neon laser has a beam power of 500 mw at a, Ask an Expert

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A HeNe (Helium-Neon) laser has a beam power of 5.00 mW at a wavelength of 656 nm. Assume the beam is focused by a lens to a circular spot whose effective diameter is 15 wavelengths of the light.

a) What is the intensity of the focused beam?
b) What is the radiation pressure exerted by the focused beam on a perfectly absorbing surface?
c) How much momentum is carried by a 1 meter length of the focused beam?

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