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Questions  >>  JEEMAIN and NEET  >>  Physics  >>  Class12  >>  Wave Optics
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Q)

A thin film of oil of μ=1.2 floats on watch of μw=43. A monochromatic light of wave length λ=9600A falls normally and it appears dark. What must be minimum change in thickness of oil film which will appear bright if normally reflected by same light.

(a)107m(b)2×107m(c)3×107(d)5×107m

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