Physics - Geometrical Optics Question with Solution | TestHub

$\begin{array}{rl}& \text{ Refractive index of medium }\\ & =\frac{\text{ speed of light in vacuum }}{\text{ speed in medium }}\\ & \Rightarrow \text{ Speed of light in medium }\\ & =\frac{\text{ speed of light in vacuum }}{\text{ refractive index }}\\ & \Rightarrow v=\frac{\mathrm{c}}{\mathrm{n}}=\frac{3\times 8^8}{1.4}=2.14\times 10^8\mathrm{m}/\mathrm{s}\end{array}$