The position of the maximum interference is found with the formula:
(assuming that the screen is away from the two slits).
The position of the minimum of interference is found with the formula:
For the yellow we have the maximum in:
while for the red we have miminum in:
In unit L / d for the yellow we derive the positions of the maximum yellow :
yg= 576, 1152, 1728, 2304, 2880, ... and of the minimum red:
yr= 336, 1008, 1680, 2352, ....
We can see that the third bright fringe yellow (except the center) is
positioned approximately at the third minimum of red.