This CalcTown calculator finds the position of dark fringes on the screen for a Young's Double Slit Experiment.

*Please
note that these values are calculated under the assumption that y=0 for
central maxima. Also,n=0 for first dark fringe on the positive side and n=-1 for first dark fringe on the negative side, and so on.

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where

λ = Wavelength of light

L= Distance between the slits and the screen

d=Distance between the two slits

y=Location of the n-th dark fringe on the screen considering the central maxima to be y=0