Question

If the index of refraction of diamond is $2.0$, velocity of light in diamond in cm/second is approximately.

• A. $6\times {10}^{10}$ cm/s
• B. $3.0\times {10}^{10}$ cm/s
• C. $2\times {10}^{10}$ cm/s
• D. $1.5\times {10}^{10}$ cm/s

Answer 1

The correct option is D $1.5\times {10}^{10}$ cm/s

${\mu }_{medium}=$ velocity of light in vaccuum/velocity of light in the medium

So, velocity of light in diamond

$\frac{3\times {10}^{10}}{2}cm{s}^{-1}=1.5\times {10}^{10}$$cm{s}^{-1}$