1.

A parallel beam of monochromatic light ofwavelength 663 nm is incident on a totallyrelfecting plane mirror. The angle of incidenceis 60° and the number of photons striklng themirror per second is 1 x 1019. the forceexerted by the light beam on the mirror willbe(A) 1 x 10-6 N(C) 1 x 10-3 N(B) 1 x 10-7 N(D) 1 x 10-9 N

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