Answer:
Refractive index of a medium \[\text{=}\frac{\text{Speed of light in air}}{\text{Speed of light in the medium}}\] For glass, \[\frac{\text{3}}{\text{2}}\text{=}\frac{\text{Speed of light in air}}{\text{2 }\times \text{ 1}{{\text{0}}^{\text{8}}}}\] Speed of light in air \[=\frac{3}{2}\times \mathrm{ }2\times \mathrm{ }{{10}^{8}}=3\mathrm{ }\times \mathrm{ }{{10}^{8}}\mathrm{ }m/s\] \[\text{Speed of light in water = 3}\,\,\times \,\text{1}{{\text{0}}^{\text{8}}}\,\times \frac{\text{3}}{\text{4}}\,\text{=}\,\text{2}\text{.25}\,\times \text{1}{{\text{0}}^{\text{8}}}\text{m/s}\]
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