Coherent monochromatic light illuminates two narrow parallel slits and the interference pattern that results is observed on a screen some distance beyond the slits.
Which change increases the separation between the dark lines of the interference pattern?
1 )
using monochromatic light of higher frequency
using monochromatic light of a longer wavelength
3 )
decreasing the distance between the screen and the slits
4 )
increasing the distance between the slits
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