A light ray passes through an infinite stack of thin transparent plates. The refrac- tive index of these plates increases slightly by a constant factor from one plate to the next. The ray enters the first plate making an angle o with the surface normal. The ray's angle to the normal changes at each new interface. At the ith interface between plates the ray makes an angle 0; to the normal. Find the limiting value 0 for the angle 0; when the ray has traversed an infinite number of plates. A B C D 0x = 00 0 = -00 0 = 0 0 = 90 E = 180 [2]