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Question

Q1. A thin oil film on a water surface appears coloured because of __________ .

reflection

interference

diffraction

polarization

Accepted Answer

Answer : interference

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 refrative index of oil is larger than that of water, therefore the reflection on the back side occurs.
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