Answer:
In Young's double slit experiment, the fringe width is given by \[\beta =\frac{D\lambda }{d}=\frac{Dc}{dv}\] Clearly, (i) When light of smaller frequency \[\left( \text{v} \right)\] is used, fringe width increases. (ii) Wavelength of light in water decreases, so fringe width \[\text{(}\beta \propto \lambda \text{)}\] also decreases.
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