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A parallel beam of monochromatic light o...

A parallel beam of monochromatic light of wavelength `600nm` is incident on a totally reflecting plane mirror. The angle of incident is `60^(@)` and the number of photon striking the mirror per second is `2.0xx10^(19)`. The force exerted by the light beam on the mirror is `axx10^(-8)N`. what is the integer value of `a`? Given `h=6.6xx10^(-34)Js`

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