# Refractive index and speed of light

## Homework Statement

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

## The Attempt at a Solution

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

???

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Chi Meson
Homework Helper
Wrong equation. If you knew what this equation was, youwould know that you cant 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 .

light speed in the media = c/n

Redbelly98
Staff Emeritus