2. A helium-neon laser of the type often found in physics labs has a beam power of 5.00 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. Calculate: a) the intensity of the focused beam b) the radiation pressure exerted on a tiny perfectly absorbing sphere whose diameter is that of the focal spot. c) the force exerted on this sphere. d) the magnitude of the acceleration imparted to it. Assume a sphere density of 5 x 10³ kg/m³.
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