Physics

Problem

A gasoline film (

n = 1.40

) floats on water (

n = 1.33

) and is illuminated from above with yellow light of wavelength

600\,\text{nm}

in air at normal incidence. What is the smallest non-zero thickness of the film that will make the reflected yellow light appear dark (destructive interference)? a)

225\,\text{nm}

110\,\text{nm}

214\,\text{nm}

428\,\text{nm}

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