12) In a soap film with a refractive index of 1.333, a 620 nm light undergoes constructive interference. Estimate the thickness of the film.
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A: Refer explanationExplanation:
Given
The refractive index of the film is
the wavelength of the light is
Since the interference is constructive then
where t is the thickness of the film, then
Hence the thickness of the film is 116.54 nm
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