The refracting angle of a glass prism is `30^@.` A ray is incident onto one of the faces perpendicular to it. Find the angle `delta` between the incident ray and the ray that leaves the prism. The refractive index of glass is `mu=1.5.`

Explanation

To solve the problem, we need to calculate the angle of deviation (Δ) between the incident ray and the ray that leaves the prism. Here are the steps to find the solution:

### Step 1: Identify the Given Data
- Refracting angle of the prism (A) = 30°
- Refractive index of glass (μ) = 1.5
- Angle of incidence (i1) on the face perpendicular to the prism = 0° (since it is perpendicular)

### Step 2: Calculate the Angle of Refraction (r1)
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