Question

What is the speed of light through an unknown glass with an index of refraction of 2.2?

Answer 1

Given:

The refractive index of glass is

$n\text{ = 2.2}$

To find the speed of light through the glass.

Explanation:

The formula to calculate the speed of light through glass is

$v=\frac{c}{n}$

Here, c is the speed of light in a vacuum whose value is

$c=\text{ 3}\times10^8\text{ m/s}$

On substituting the values, the speed of light through the glass will be

$\begin{gathered} v=\frac{3\times10^8}{2.2} \\ =1.36\text{ }\times10^8\text{ m/s} \end{gathered}$

Thus, the speed of light through glass is 1.36 x 10^(8) m/s