A light ray enters a rectangular block of plastic at an angle of θ1 = 48.0∘ and emerges at an angle of θ2 = 77.5∘ as shown in the figure below. (a) Determine the index of refraction of the plastic. (b) If the light ray enters the plastic at a point L = 50.0 cm from the bottom edge, what time interval is required for the light ray to travel through the plastic? ns
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