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A beam of wavelength 5.50 x 10^2 nm falls on a screen containing a pair of narrow slits separated by 0.10 mm. Calculate the separation between the two seventh order maxima on a screen 2.0 m from the slits.

and

Calculate the longest wavelength of light falling on double slits separated by 1.20 x 10^-6 m for which there is a first order maximum. In what part of the spectrum is this light?

any help would be appreciated. thanx