Question

The refractive index of glass is $1.5$, the velocity of light in glass is

• A. $1.5\times {10}^{8}m/s$
• B. $2\times {10}^{8}m/s$
• C. $3\times {10}^{8}m/s$
• D. $4.5\times {10}^{8}m/s$

Answer 1

The correct option is B $2\times {10}^{8}m/s$

We Know,

$\frac{{\mu }_{glass}}{{\mu }_{vaccum}}=\frac{c}{v_{glass}}=1.5$

$v_{glass}=\frac{3\times {10}^8}{1.5}=2\times {10}^{8}m/s$

Hence Option $\text{B}$ is the correct amswer.