Since the red filter absorbs all colors except for red, the light must contain red as a primary component. The cyan filter absorbs all colors excluding blue and green, and since blue is the only reflected color, the light must have blue as another primary component, but not green. The light must be composed of blue and red light, so it is magenta.
What is the Brewster angle of a boundary between air and crown glass (n=1.52)?
The Brewster angle is the angle when the initial ray and refracted ray equal 90 degrees, so ~56.66 degrees
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