Calculate the minimum thickness of the film μ=1.4 in which interference of violet component λ=400 nm of incident light can take place by reflection.

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7143A0

7.143A0

71.43A0

714.3A0

answer is D.

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Detailed Solution

For constructive interference, 2μt=2m+1λ2,m=0,1,2.......... ∴tmin=λ4μ=400×10−94×1.4=714.3A0

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