Will a ray go undeviating if the medium on both sides of a slab are different?

Explanation

To determine whether a ray of light will go undeviated when passing through a slab with different refractive indices on both sides, we can analyze the situation step by step.

### Step-by-Step Solution:

1. **Identify the Slab and Mediums**:
- We have a slab with two different mediums on either side. Let’s denote the refractive index of the medium on the left side as \( n_1 \), the refractive index of the slab as \( n \), and the refractive index of the medium on the right side as \( n_2 \).

2. **Incident Ray**:
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