Calculate the speed of light in the prism if a ray of light is passing through an equilateral triangular glass prism from air and undergoes minimum deviation when angle of incidence is `5//4`th of the angle of prism.

Explanation

To solve the problem of calculating the speed of light in the prism, we will follow these steps:

### Step 1: Determine the angle of the prism
Given that the prism is equilateral, the angle of the prism \( A \) is \( 60^\circ \).

### Step 2: Calculate the angle of incidence
The angle of incidence \( i \) is given as \( \frac{5}{4} \) times the angle of the prism. Therefore:
\[
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