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Dear Ria ,
Change in momentum of photon due to absorbtion = h /λ
no of photons per unit time = p/(hc/λ ) p = power of beam
therefore change in momentum per unit time = force = h /λ * p/(hc/λ ) = p /c
p = intensity * area = .5 * 4*pie*r2 = .5 *4*3.14*(1)2 = 6.28 W
so force = 6.28 /3 *108 = 2.09 * 10-8 N . The answer of this question in some books as found by me is incorrect.
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