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Problem 4 A light ray is incident on a rectangular slab of plastic at an angle 01 = 45.0'. It then emerges from the slab at an angle of 02 = 76.0' as shown below. 01 n L 02 (a) What is the index of refraction for the plastic? (b) Suppose the wavelength of the light in vacuum is do = 530 nm. What is the wavelength and frequency of the light in the plastic? (c) If the vertical distance between the bottom of the slab and the point at which the light enters the plastic is L = 50.0 cm, how long does it take for the light to travel through the plastic