Question

If the speed of light in a medium is $1.5\times {10}^8$ m/s, then the absolute refractive index of the medium is .

• A. $1$
• B. $2$
• C. $3$

Answer 1

The correct option is B $2$

Given,
Speed of light in the medium = $1.5\times {10}^{8}m/s$
Absolute refractive index = $\frac{speedoflightinvacuum}{speedoflightinthemedium}$
Therefore, the absolute refractive index $=\frac{(3\times {10}^8)}{(1.5\times {10}^8)}=2$ .