Question: A laboratory dish, (20 mathrm{~cm}) in diameter, is half filled with V. water. One at a time, (0.50 mu mathrm{L}) drops of oil from a

A laboratory dish, $20 \mathrm{~cm}$ in diameter, is half filled with V. water. One at a time, $0.50 \mu \mathrm{L}$ drops of oil from a micropipette are dropped onto the surface of the water, where they spread out into a uniform thin film. After the first drop is added, the intensity of $600 \mathrm{~nm}$ light reflected from the surface is very low. As more drops are added, the reflected intensity increases, then decreases again to a minimum after a total of 13 drops have been added. What is the index of refraction of the oil?

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