Why are the taking n and m as 4 and 5?
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bcoz they are the distance from the center, of the fringes from on the screen and as they are 2 fringes so m and n can not be equal
bright fringe =( n x Landa x D) / d
dark = (n x lamda x D) / 2d
kritika5874:
How to measure the distance of the fringes from the centre
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