Refraction by Plane Surfaces: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Refraction by Plane Surfaces. Understanding the underlying formula is key to arriving at the correct answer below:

Total apparent thickness of the glass slab is $d_{app} = 5 + 2 = 7 cm$.
Using the relation $d_{app} = \frac{t}{\mu}$, the real thickness is $t = d_{app} \times \mu$.
Substituting the given values, $t = 7 \times 1.5 = 10.5 cm$.