1. When a patient applies an eye drop for the treatment of glaucoma, the eye drop is transported to the tear system by a thin tear film. The eye drop diffuses to the eye at 25 C, through a thin tear film layer thickness of 0.07 mm, and the concentration of the eye drop in the tear (point 1) and the other boundary of the tear film (point 2) is 34 wt% (density pl = 840 kg/m) and 9 wt% (density p1=1030 kg/m), respectively. The diffusivity of eye drops in tears is 0.41x10-9 m/s. Assuming a steady state and one boundary impermeable to tear, calculate the rate of diffusion of eye drop across a film. The molecular weight of the eye drop and tear is 320 kg/kmol and 235 kg/kmol, respectively. (20p) Eye drop Tear film 0.07 mm