Answer:
We know that : \[\text{ }\!\!\mu\!\!\text{ =}\frac{\text{Speed of light in air}}{\text{Speed of light in medium}}\] \[\Rightarrow \] \[2.4=\frac{3\times {{10}^{8}}}{Speed\text{ }of\text{ }light\text{ }in\text{ }medium}\] \[\Rightarrow \] \[\text{Speed of light in medium=}\frac{\text{3 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{8}}}}{\text{2}\text{.4}}\] \[=1.25\times {{10}^{8}}m/s.\]
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