Due to effect of interference, floating oil layer in water is visible in coloured, for observati...

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Due to effect of interference, floating oil layer in water is visible in coloured, for observation of this event the thickness of oil layer should be :
a. \( 100 \mathrm{~nm} \)
b. \( 1000 \mathrm{~nm} \)
c. \( 1 \mathrm{~mm} \)
d. \( 10 \mathrm{~mm} \)
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