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Fringe Width in YDSE

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Question

In videos destructive interference is given (2n+ 1)lambda/2 where as in board book it is given by (2n - 1)lambda/2. Which of these is correct for destructive interference?

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Solution

both are correct.

in (2n+1)lambda/2

n = 0,1,2,3...

but in (2n-1)lambda/2
n=1,2,3......

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