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A parallel beam of light of wavelenght `560 nm` falls on a film of oil (refractive index `=1.4`). What should be the minimum thickness of the film so

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A parallel beam of light of wavelenght `560 nm` falls on a film of oil (refractive index `=1.4`). What should be the minimum thickness of the film so that it weakly transmits the light ?
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Correct Answer - `100 mm`
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