Red light is incident in air on a 30° -60°-90° prism as shown. The incident beam is directed at an angle of ₁ = 40.20 with respect to the horizontal and enters the prism at a height h = 20 cm above the base. The beam leaves the prism to the air at a distance d = 54.2 along the base as shown.
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1, 2 and 3 are right. I just need help with 4, 5 and 6
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