At a certain plane in space, the particle flux density is isotropic for 0 ws1 and zero for negative w, where w is the cosine of the angle made by the particle direction and a normal to the plane of reference. in that plane, what is (a) jn (w), the angular distribution of the flow rate, and (b) jt, the flow rate for all positive w?

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90