Assertion :Colours can be seen in thin layers of oil on the surface of water. Reason: White light is composed of several colours.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Colours are seen in thin layer of oil on the surface of water,
because of interference of light due to the path difference
which is caused in the light due to reflections from top and
bottom surface of the oil film..

Reason is Correct, but can't explain the assertion.

Hence $B$ is the correct answer.

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