How Does Light Intensity Vary with One Slit in a Diffraction Experiment?

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In a diffraction experiment using one slit, the light intensity is characterized by a central fringe that is brighter and wider than the symmetrical side fringes. The central maximum is approximately twice the width of the side fringes due to the single-slit diffraction pattern. The maximum brightness occurs in the middle because it represents the point of constructive interference. The existence of fringes with two slits is due to the interference of light waves, a concept that also applies to single-slit diffraction, albeit with a different intensity distribution. Understanding these principles clarifies the behavior of light in diffraction experiments.
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If one slit is used instead of 2 in a diffraction experiment, how does light intensity vary?

I think.. Central fringe brighter, symmetrical fringes either side of central fringe, central maximum twice the width of side fringes..

But I'm not sure why?

Also, using diffraction gratings – why is the maximum brightness in the middle?
 
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Think about why fringes exist at all when you have 2 slits. Does the same reasoning apply with 1 slit?
 

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