Question: A light ray enters a rectangular block of plastic at an angle Î¸1 = 45.0° and emerges at an angle Î¸2 = 76.0°, as shown

A light ray enters a rectangular block of plastic at an angle Î¸1 = 45.0° and emerges at an angle Î¸2 = 76.0°, as shown in figure.
(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 theplastic?

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