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 = 4.70 cm and y = 21.5 cm. Screen Glass Air ' '
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