In YDSE a parallel beam of incident lig...

In YDSE a parallel beam of incident light consists of two wavelengths `lambda_(1)=4000Å and lambda_(2)=5600Å`. The minimum distance y on the screen, measured from the central axis, where the bright fringe due to two wavelengths coincide is `(nlambda_(1)D)/(d)`. Find n.

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