Answer:
For intensity distribution of light in diffraction at a signal slit, see Fig. Width of central maximum is given by \[{{\beta }_{0}}=\frac{2D\lambda }{d}\] (i) When wavelength\[(\lambda )\] of light used is increased, the width of central maximum increases. (ii) When width (d) of the slit is increased, the width of central maximum decreases. Wavelength of light in water decreases, so width of central maximum also decreases.
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