In this question, a statement of assertion 
is followed by a statement of reason (R). 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.
Text Solution
Verified by ExpertsB
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 equation 
. The colour of the film will depend upon the thickness and the angle of refraction.
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