Question

The refractive index of diamond is 2. The velocity of light (in cm/sec) in diamond will be:

• A. $6\times {10}^{10}$
• B. $2\times {10}^{13}$
• C. $1.5\times {10}^{10}$
• D. $3\times {10}^{10}$

Answer 1

The correct option is C $1.5\times {10}^{10}$

Velocity of light in vacuum = $3\times {10}^{10}cm/sec$

Velocity in diamond = $Velocityinvacuum/refractiveindexofdiamond$

=> Velocity of light in diamond =$\frac{3\times {10}^{10}}{2}$ = $1.5\times {10}^{10}cm/sec$