Question

The velocity of light in air is \(3 \times 10^{8} \mathrm{~ms}^{-1}\). Calculate the velocity of light in diamond of refractive index 2.5.

Answer 1

\[\mu = \frac{\text{speed of light in air}}{\text{speed of light in diamond}}\]

\[\text{Speed of light in diamond} = \frac{3 \times 10^{8}}{2.5}\]

\[= 1.2 \times 10^{8} \mathrm{~ms}^{-1}\]

Therefore, the velocity of light in diamond is \(1.2 \times 10^{8} \mathrm{~ms}^{-1}\).