Answer:
The linear width of central bright maximum is given by \[{{\beta }_{0}}=\frac{2D\lambda }{d}\] (i) If monochromatic yellow light is replaced with red light, the linear width of the central maximum increases because\[{{\lambda }_{red}}>{{\lambda }_{yellow}}\]. (ii) If the distance (D) between the slit and the screen is increased, the linear width of the central maximum increases.
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