Colours appear on a thin soap film and on soap bubbles due to the phenomenon of :

interference

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dispersion

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refraction

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diffraction

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Solution

The correct option is A interference
The colours seen in a soap bubble arise from interference of light reflecting off the front & back surfaces of the thin soap film. Depending on thickness of film, different colours interfere constructively & destructively.

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Explain the formation of colours in thin films (example soap film).

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