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light from a red laser (lamda=700nm) illuminates two slits. At the same time light of a...

light from a red laser (lamda=700nm) illuminates two slits. At the same time light of a different wavelength passes through the two slits. The interference pattern that can be seen on the far viewing screen is a mixture of the two colours however the center of the third bright fringe of red is pure red, with none of the other colour present. What are the possible wavelengths for the second colour of light?

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