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A parallel beam of monochromatic light o...

A parallel beam of monochromatic light of wavelength 663 nm is incident on a totally reflecting plane mirror. The angle of incidence is `60^@` and the number of photons striking the mirror per second is `(1.0 xx (10^19))`. Calculate the force exerted by the light beam on the mirror.

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`1xx10^(-8)N`
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