Does the inverse square law apply to laser/coherent light?
Originally posted by Integral
I believe that r-2 laws only apply to sources which emit energy into a significant portion of a sphere.
You have to also be given the divergence angle.Originally posted by kishtik
Then how can we determine the radius of a laser beam with a given distance and starting radius?
I had no idea about that but now I think that shouldn't be hard with the div. angle. We can solve it analitically or using direct proportion. Am I wrong?Originally posted by chroot
You have to also be given the divergence angle.