Question

Refractive index of diamond for light of wavelength 589 nm is 2.419. What is the velocity of light in diamond. Velocity of light in vacuum is $3\times {10}^8$ m/s.

Answer 1

Given : $V_{vacuum}=3\times {10}^{8}m/s$ $n=2.419$

Velocity of light in diamond $V_{diamond}=\frac{V_{vacuum}}{n}$

$⟹V_{diamond}=\frac{3\times {10}^8}{2.419}=1.24\times {10}^{8}m/s$