According to the Maxwell electric-magnetic theory,this essay concludes that the conservation law of linear momentum in a laser field,with the expressions of optical scattering force and the gradient force obtained.The optical angular momentum has been analysed and hence suggests the theory of forces acting on biophysical particles in a laser field.General applications of optical forces are discussed,with an emphasis on the issue of optical tweezers,with its current applied situations and future in life sciences.
hohoho,looks like one of my courseworks for the cambridge application,good luck mate.i do physics as well,in england.