Do you know the answer?
1.33 * 10^(-7)
Pls upload it again
Why cant we do it by getting intensity at some height as Power/4pir^2 and then finding cgange in momentum at the height as 2I/c
U can do it when dist b/w source and pt is much greater than radius of lens
@akash_2020 Can you please explain the second step p'=p/2(1-cosx)
It is concept of solid angle (which you probably encountered in gauss theorm)