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a metallic sphere of radius R is kept in the path of a parallel beam of light of intensity I.the force exerted by beam on the sphere (where c=velocity of light & metallic sphere absorbed all light.
dear sushant raj,
momentum p= u/c, u=energy & c= velocity of light,
I= U/A , a= area
for the sake of simplicity we are taking area A to be ΠR2
therefore u= I*A=I*pi *R2
=> p = I*pi *R2/c
and f=dp/dt
considering that light strikes for a small time interval of delta t
therefore F= I*pi *R2/c*deltat
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