Two point sources of coherent, monochromatic light with wavelength $\lambda$ are near each other. The light from these sources is interfering in space around them. If you determine there is destructive interference between the two sources at a point 7.28 µm away from one source and 5.72 µm away from the other, what could the wavelength of the light be?
(Note that the image shown is not drawn to scale.)
7.28 µm
destructive interference
here
Source 1
567 nm
312 nm
367 nm
780 nm
624 nm
5.72 µm
Source 2