**(a)**

$\overline{){\mathbf{N}}{\mathbf{\lambda}}{\mathbf{=}}\frac{\mathbf{d}\mathbf{x}}{\mathbf{L}}}$

When the maxima are located at the same spot:

The first order maximum caused by a double slit illuminated with light of wavelength 625 nm is found at some spot on a screen. The light source is changed to a new wavelength which places its second order (m=2) maxima at the same spot where the 625 nm first order maxima used to lie.**(a)** What is the wavelength of the new light source?**(b)** Is this wavelength is the visible range?

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