Doubt in wave particle duality

Do you know the answer?

1.33 * 10^(-7)

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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)

Thanks got it @Ankith_2020 @akash_2020