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Q.

A parallel beam of monochromatic light of wavelength 663 nm is incident on a totally reflecting plane mirror. The angle of incidence is 600 and the number of photons striking the mirror per second is1.0 x 1019. The value of the force exerted by it on the surface is

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a

10-6 N

b

10-7 N

c

10-8 N

d

10-9 N

answer is C.

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Detailed Solution

Force totally reflecting surface,

F=2Pcos60°c

=2×nhcλcos60°c=1019×6.6×10-34663×10-9=10-8 N

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