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NEET UG PHYSICS MCQ: WAVE OPTICS
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A thin transparent film with refractive index 1.4, is held on circular ring of radius 1.8 cm. The fluid in the film evaporates such that transmission through the film at wavelength 560 nm goes to a minimum every 12 seconds. Assuming that the film is flat on its two sides, the rate of evaporation is _____
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Correct option: A
54
Option A (54) is correct. The rate of evaporation is calculated by considering the change in thickness of the film and the time interval for minimum transmission.
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