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An oil $(μ_{o i l} = 1.45)$ flowing on water seems coloured due to interference. For observing this effect, the approximate thickness of the oil film should be

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Correct option is B

Condition for constructive interference is-2μoild= λair2 Hence, λ=4μoildFor visible light , 400nm < λ< 700nm400nm < 4μoild < 700nmGiven : μoil=1.45Hence, 689.65A0 < d < 1206.8A0

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An oil μoil=1.45 flowing on water seems coloured due to interference. For observing this effect, the approximate thickness of the oil film should be

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An oil $(μ_{o i l} = 1.45)$ flowing on water seems coloured due to interference. For observing this effect, the approximate thickness of the oil film should be