A light ray enters a rectangular block of plastic at an angle θ1 = 45.0° and emerges at an angle θ2 = 76.0°, as shown in Figure P35.71.
(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, how long does it take the light ray to travel through the plastic?

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12 e1