A beam of light enters a flint glass semicircular disk with an index of refraction of n. = 1.66 at the midpoint of the flat side as shown in the figure. Determine the angle of incidence in air such that the refracted light will travel through the glass along a normal to the semicircular surface and hit a projection screen with the coordinates x = 5.90 cm and y = 17.2 cm. - X Screen Glass Air