When a double slit is illuminated with light of wavelength

When a double slit is illuminated with light of wavelength 510 nm, the interference maxima on a screen 2.4 m away gradually decrease in intensity on either side of the 2.40-cm-wide central maximum and reach a minimum in a spot where the fifth-order maximum is expected.
(a) What is the width of the slits?
(b) How far apart are the slits?

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