A laser beam of power 20W incident norma...

A laser beam of power 20W incident normally on a surface. if 25% light is absorbed and rest reflected find magnitude of force experienced by the surface.

`1.16xx10^(-7)N`

`2.32xx10^(-3)N`

`4.12xx10^(-2)N`

`5.21xx10^(-7)N`

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