If v is the velocity of light in air or vacuum, find the time taken by the light to travel through a glass slab of thickness x and having refraction index `mu`.

Explanation

To find the time taken by light to travel through a glass slab of thickness \( x \) and having a refractive index \( \mu \), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Refractive Index**:
The refractive index \( \mu \) of a medium is defined as the ratio of the speed of light in vacuum (or air) \( v \) to the speed of light in that medium \( v_1 \):
\[
\mu = \frac{v}{v_1}
...