A ray of light is incident normally on one of the refracting surfaces of a prism of refracting angle A,. The emergent ray grazes the other refracting surface. Find the refractive index of the material ofprism.

Explanation

To find the refractive index of the material of the prism when a ray of light is incident normally on one of the refracting surfaces and the emergent ray grazes the other refracting surface, we can follow these steps:

### Step 1: Understand the Geometry of the Prism
- Let the refracting angle of the prism be \( A \).
- The ray of light is incident normally on the first surface, which means the angle of incidence \( i_1 = 0^\circ \).
- The ray will refract into the prism and will make an angle \( r_1 \) with the normal at the first surface.

### Step 2: Apply Snell's Law at the First Surface
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