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  4. In order that a thin film of oil floating on die surface of water shows colours due to interference, the thickness of the oil film should be of the order of:

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Q. In order that a thin film of oil floating on die surface of water shows colours due to interference, the thickness of the oil film should be of the order of:

Rajasthan PMTRajasthan PMT 2004Wave Optics

Solution:

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\,\mathring{A}$ is the correct answer since range of wavelength of visible light is $ 4000\,\mathring{A}$ to $ 4900\,\mathring{A}$