The answer is: The slit width is halved.
Minima are the points of low intensity in a diffraction pattern. They appear due to destructive interference between light waves scattered by different points of a lattice or crystal. Minima occur when the path difference between two waves is equal to an integer multiple of the wavelength of the light.
When the slit width is halved, the angles at which the diffraction minima appear are decreased because the diffraction pattern becomes more focused due to the reduced aperture size. This causes the minima to be closer together and have smaller angles. The other alterations do not affect the angles at which the minima appear.
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