Chapter SH, Problem 12.7APP

To determine

To calculate: Speed of light in rock salt.

Answer to Problem 12.7APP

Speed of light in rock salt is $\underset{\_}{197368.42\text{ km/s}}$ .

Explanation of Solution

Given:

Refractive index = $1.52$

Speed of light in vacuum = $300,000\text{ km/s}$

Formula used:

Refractive index is given by:

  $n=\frac{c}{v}$

Where c is the speed of light in vacuum, and v is the speed of light in a material.

Calculation:

Speed of light in rock salt is calculated as:

  $\begin{array}{l}n=\frac{c}{v}\\ v=\frac{c}{n}\\ v=\frac{300000\text{ km/s}}{1.52}\\ v=197368.42\text{ km/s}\end{array}$

Conclusion:

Speed of light in rock salt is $\underset{\_}{197368.42\text{ km/s}}$ .