Refraction by Prism: Practice Problem & Solution

Solution Explained:

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

At the minimum deviation position, the refracted ray is parallel to the base, and $r_1 = r_2 = A/2$. Given the prism angle $A = 60^\circ$, the angle of refraction at the first face is $r_1 = 60^\circ / 2 = 30^\circ$.