In a laboratory experiment, a diffraction grating produces an interference pattern on a screen. If the number of slits in (including the slit spacing) the same, then
The fringes stay the same brightness and get closer together.
The fringes stay the same brightness and get farther apart.
The fringes stay in the same positions but get dimmer and wider.
The fringes stay in the same positions but get brighter and narrower.
The fringes get brighter, narrower, and closer together.
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