Question

The speed of light in water and glass is 2.2$\times$10${}^8$ m/s and 2$\times$10${}^8$ m/s ,respectively. What is the refractive index of glass w.r.t water?

• A. 1
• B. 1.1
• C. 0.909
• D. 0.8

Answer 1

The correct option is B 1.1

In this case, the refractive index of glass with respect to water is given as:

$n=\frac{speedoflightinwater\left(v_1\right)}{speedoflightinglass\left(v_2\right)}$

where, the speed of light in water medium $v_1=2.2\times {10}^{8}m/s$ and the speed of light in glass medium $v_2=2\times {10}^{8}m/s$.

Therefore, $n=\frac{2.2\times {10}^{8}m/s}{2\times {10}^{8}m/s}=1.1$.

Hence, the refractive index of the transparent medium is 1.1