When does a ray of light falling on a lens pass through it undeviated ?

Explanation

To determine when a ray of light passes through a lens undeviated, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Lens Structure**:
- A lens has two main parts: the optical center and the principal axis. The optical center is a specific point within the lens where light can pass through without bending.

2. **Identify the Optical Center**:
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