Determine the smallest thickness of the film for which reflected green light of wavelength 540 nm interfere destructively. Express your answer with the appropriate units.

Explanation:

Given

Wavelength of green light

For destructive interference by reflection the path difference is an integral multiple of wavelength so

where

n=refractive index of medium

suppose water is the medium

so

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.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue