The width of central maximum increases if the wavelength is increased.
The width of the central maximum is simply the distance between 1st order minima from the center of the screen on both sides. Thus, the central maximum becomes twice as wide if the slit width a becomes half as wide.
For one slit experiment, the size(angular width) of the central maximum is given by a 2 λ a , where a is that the slit width. therefore the width of the central maximum is directly proportional to the wavelength of light and inversely proportional to slit width.
A central maximum is that the brightest central zone of a diffraction pattern on the screen. The central maximum has the utmost intensity and widest of all the other diffraction fringes
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