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An oil drop of volume 0.2 c.c. is dropped on the surface of a tank of water of
area 1 sq. meter. The film spreads uniformly over the surface and white light
which is incident normally is observed through a spectrometer. The spectrum is
seen to contain one dark band coincides with wavelength 5.5 x 10 cm in air.
-5
Find the refractive index of oil.

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