A double-slit experiment is performed to measure the wavelength of a monochromatic light source. It is foundthat the nodal lines are too close together to be easily observed. Consider the following changes:I. the slit separation is increasedII. the distance between the slits and the source is increasedIII. the distance between the slits and the screen is increasedIV. the wavelength of the light is increasedThe best combination of the above changes which would increase the average distance between the nodallines observed is

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