Question

Light travels at a speed of equation m/s in air. What is the speed of light in glass, which has an index of refraction of 1.5?

Answer 1

`2* 10^(8)\ \text{m/s}`

Step-by-step explanation:

`n` = Refractive index of glass = 1.5

`c` = Speed of light in vacuum =
`3* 10^8\ \text{m/s}`

Refractive index is given by

`n=(c)/(v)\\\Rightarrow v=(c)/(n)\\\Rightarrow v=(3* 10^8)/(1.5)\\\Rightarrow v=2* 10^(8)\ \text{m/s}`

The speed of light in the glass is
`2* 10^(8)\ \text{m/s}`.