In order to protect eyes from damaging near ultraviolet light (UVA with wavlength of 389 nm), sunglasses are often coated so this light is reflected. The index of refraction of the plastic coating is 1.37, the index of refraction of the glass this coating is placed on is 1.55 and the thickness of the glass is 1.61 mm. What thickness coating should be used

16. a brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 n on him. the mass of the losing player plus equipment is 90.0 kg, and he is accelerating at 1.20m/s2 size 12{1 "." "20"" m/s" rsup { size 8{2} } } {} backward. (a) what is the force of friction between the losing player’s feet and the grass? (b) what force does the winning player exert on the ground to move forward if his mass plus equipment is 110 kg? (c) draw a sketch of the situation showing the system of interest used to solve each part. for this situation, draw a free-body diagram and write the net force equation.