Laser light can be focused (at best) to a spot with a radius r equal to its wavelength λ, Suppose a 1.0-W beam of green laser light (λ = 5 x 10-7 m) forms such a spot and illuminates a cylindrical object of radius r and length r (Fig. 22-23). Estimate
(a) The radiation pressure and force on the object, and
(b) Its acceleration, if its density equals that of water and it absorbs all the radiation.

-r- A = 5 x 10-7 m