In this question, a statement of assertion is followed by …

Physics Wave Optics Assertion & Reason MCQ (Single Correct)

In this question, a statement of assertion is followed by a statement of reason . Mark the correct choice as:

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

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true but reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If both assertion and reason are false.

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The correct answer is:

Colours are seen in thin layer of oil on the surface of water, because of interference of light. When white light falls on a thin film of a liquid it will appear bright having colour whose wavelength satisfies the relation . The colour of the film will depend upon the thickness of the film and the angle of refraction.

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