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so here i have shown the distances of two dark fringes ...

from here ... fringe width is [tex]\frac{\lambda L}{2d}[/tex]

L is distance of screen ... d is distance b/w 2 fringes.

but fringe width is [tex]\frac{\lambda L}{d}[/tex] , right ???

What mistake am i making?

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# Young's Double Slit Experiment

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