A light ray is incident on a plane glass slab of thickness ‘t’ at an angle of incidence ‘i’ as shown in the figure. If `mu` is the refractive index of glass. Then find time taken by the light ray to travel through the slab.

Explanation

To find the time taken by a light ray to travel through a plane glass slab of thickness ‘t’ at an angle of incidence ‘i’, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Given Variables:**
- Thickness of the glass slab, \( t \)
- Angle of incidence, \( i \)
- Refractive index of glass, \( \mu \)
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