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Solution: A laser beam has a wavelength of 633 nm and a power of 0.500...

Question

A laser beam has a wavelength of 633 nm and a power of 0.500 mW spread uniformly over a circle 1.20 mm in diameter. This beam falls perpendicularly on a perfectly reflecting piece of paper having twice the diameter of the laser beam and a mass of 1.50 mg. What are the amplitudes of the electric and magnetic fields in this laser beam?