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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 whose centre has
wavelength 5.5 x 10 cm in air. Find the refractive index of. M
oil.
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