Due to effect of interference, floating oil layer in water is visible in coloured, for observation of this event the thickness of oil layer should be :
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A
When we observe the colours of the thin film oil floating over the surface of water, The thickness of the film must be of the order of the wavelength of visible light. Therefore out of given options 5000 Å is the correct answer since range of wavelength of visible light is 4000 Å to 4900 Å.
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