Question

A helium-neon laser of the type often found in physics laboratories has a beam power of 4.00 mW at a wavelength of 633 nm. The beam is focused by a lens to a circular spot whose effective diameter may be taken to be equal to 2.00 wavelengths.

A). Calculate the intensity of the focused beam.

B). Calculate the radiation pressure exerted on a tiny perfectly absorbing sphere whose diameter is that of the focal spot.

C). Calculate the force exerted on this sphere.

D). Calculate the magnitude of the acceleration imparted to it. Assume a sphere density of 5.60

Answer 1