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Geometrical optics: A film of oil floats on a pool of water; Find the angle the light beam makes with the vertical as it travels through the water.

A film of oil, with an index of refraction of 1.48 and a thickness of 1.80 cm, floats on a pool of water. A beam of light is incident on the oil at an angle, theta = 52.2° to the vertical.

Find the angle the light beam makes with the vertical as it travels through the water.

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