In a double-slit experiment, light from two monochromatic light sources passes t

Question

In a double-slit experiment, light from two monochromatic light sources passes through the same double slit. The light from the first light source has a wavelength of 617 nm. Two different interference patterns are observed. If the 7th order bright fringe from the first light source coincides with the 10th order bright fringe from the second light source, what is the wavelength of the light coming from the second monochromatic light source?
(in nm)

Explanation / Answer

n*lamda1*D/d=n*lamda2*D/d

=>7*617=10*x

=>431.9 nm

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