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Optical Path Length

The interferi...

Question

The interfering fringes formed by a thin oil film on water are seen in yellow light of sodium lamp. We find the fringes

A

coloured

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B

black and white

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C

yellow and black

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D

coloured white yellow

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Solution

The correct option is A yellow and black
When the yellow light of sodium lamp interferes constructively we get yellow bright band, and when they interfere destructively we get black bark band.

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