Question: In two separate double slit experiments, an interference pattern is observed on a screen. In the first experiment, violet light ( = 708 nm) is

In two separate double slit experiments, an interference pattern is observed on a screen. In the first experiment, violet light ( = 708 nm) is used and a second-order bright fringe occurs at the same location as a third-order dark fringe in the second experiment. Determine the wavelength of the light used in the second experiment.

I have been seeing that 495 is the anwser but i dont know how

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