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  1. A thin oil film on a water surface appears coloured because of

  2. A.

     Reflection

    B.

     Interference

    C.

     Diffraction

    D.

     Polarization

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    Answer : Option B

    Explanation :

    A thin oil film on a water surface appears coloured because of thin-film interference which involves the interference of light waves reflecting off the top surface of a film with the waves reflecting from the bottom surface. The refractive index of oil is larger than that of water, therefore the reflection on the back side occurs.


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