A parallel beam of light of wavelength 560 nm falls on a thin 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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100 nm
Sol. Clearly for weak transmition, it should be destructive interference.
⇒ 2 μ t = 
{for smallest thickness}
⇒ t = 
= 
= 100 nm
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