Answer:
As \[\mu =\frac{\sin i}{\sin r}=\frac{c}{\upsilon }\] or \[\upsilon =\frac{\sin r}{\sin i}.c\] For a given angle of incidence, \[\upsilon \propto \sin r\] \[{{\upsilon }_{A}}\propto \sin {{15}^{\circ }},\]\[{{\upsilon }_{B}}\propto \sin {{25}^{\circ }},\] \[{{\upsilon }_{C}}\propto \sin {{35}^{\circ }}\] But \[\sin {{15}^{\circ }}<\sin {{25}^{\circ }}<\sin {{35}^{\circ }}\] \[\therefore \] \[{{\upsilon }_{A}}<{{\upsilon }_{B}}<{{\upsilon }_{C}}\] i.e., velocity of light is minimum in medium A.
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