Answer:
Fringe width, \[\beta =\frac{\lambda D}{d}\] i.e., \[\beta \propto \lambda \] As\[{{\lambda }_{G}}<{{\lambda }_{\Upsilon }}<{{\lambda }_{0}}\] , therefore, \[{{\beta }_{G}}<{{\beta }_{\Upsilon }}<{{\beta }_{0}}\] .
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