(a) Draw a ray diagram showing the passage of light through a glass prism. Hence obtain a relation between the angles of deviation, incidence and emergence and angle of prism.
(b) Show that no ray can pass through a prism whose refracting angle `A` is greater than twice the critical angle for the material of the prism.

Explanation

### Step-by-Step Solution

**(a) Ray Diagram and Relation Derivation**

1. **Draw the Prism**: Start by sketching a glass prism. Label the angles of the prism as \( A \).

2. **Incident Ray**: Draw a light ray incident on one face of the prism. Label the angle of incidence as \( I \).

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