Refractive index and speed of light

[3instein]

Homework Statement

A slab of glass has a refractive index of 1.3. What will be the speed of light in this glass?

Homework Equations

The Attempt at a Solution

$$\frac{sin i}{sin r}=1.3$$

?

 

[Chi Meson]

Wrong equation. If you knew what this equation was, youwould know that you can't use it. The "i" and "r" are referring to angles, and are any angles given?

Try the equation that defines the index of refraction, n .

 

[scivet]

light speed in the media = c/n

 

[Redbelly98]

Welcome to Physics Forums scivet!

We try to give hints to people, rather than giving the answer, when it's a homework question.

But since the question is from last semester, no harm done!