Question

A light ray enters a rectangular block of plastic at an angle of θ1 = 45.5°...

A light ray enters a rectangular block of plastic at an angle of θ1 = 45.5° and emerges at an angle of θ2 = 74.0°.

(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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