4. In the figure below, light enters the air-water interface and exits the water-glass interface, Determine the angle 02 and 03 if 01 is 20° as shown in the diagram. The index of refraction for air, water and glass is 1, 1.33 and 1.5 respectively. Show your calculations and derivation in detail. Angles are not drawn to scale. Air 0 water glass 03

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