As we learnt in
Young Double Slit Experiment -
- wherein
Distance of a point on screen from central maxima
Path difference at that point
Ref y be the distance from the central maximum to the point where the bright fringes due to both the wavelength coincides
For , ,
for ,
i.e. with respect to central maximum 4th bright fringe of coincides with 5th bright fringe of
or y = 7.8 mm
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