A helium-neon laser of the type often found in physicslaboratories has a beam power of 7.00 mW at a wavelength of 633 nm.The beam is focused by a lens to a circular spot whose effectivediameter may be taken to be equal to 2.00 wavelengths.
Calculate the intensity of the focused beam.
Calculate the radiation pressure exerted on a tiny perfectlyabsorbing sphere whose diameter is that of the focal spot.
Calculate the force exerted on this sphere.
Calculate the magnitude of the acceleration impartedto it. Assume a sphere density of 4.50×103kg/m3.