A double slit mask is illuminated by light with wavelength λ1 = 625 nm. The first order maximum of the resulting two-slit interference pattern is found at some spot on a screen. The light source is then changed to a new wavelength, λ2. The second order (m = 2) maxima now falls at the same spot where the first order maxima of the λ1 = 625 nm pattern used to lie. (a) What is the wavelength, λ2, of the new light source? (b) Is this wavelength in the visible range?