In which of the following conditions the ray will not be deviated on passing through the lens ?

Options

A. The ray passes through optical centre
B. The ray passes through 2F
C. The ray passes through first focus
D. The ray passes parallel to principal axis

Explanation

To determine the condition under which a ray of light will not be deviated when passing through a lens, we can analyze the behavior of light rays in relation to the lens's optical center.

### Step-by-Step Solution:

1. **Understanding the Lens**: A lens is a transparent optical device that refracts light. It has two main types: convex (converging) and concave (diverging). The behavior of light rays varies depending on the type of lens and their position relative to the lens.

2. **Identify the Optical Center**: The optical center of a lens is a specific point where light rays passing through it do not experience any deviation. This point is located at the center of the lens.

3. **Ray Passing Through Optical Center**: When a ray of light passes through the optical center of a lens, it continues in a straight line without bending or changing direction. This is because the angle of incidence and the angle of refraction are equal at this point.

4. **Other Conditions**:
- A ray passing through the focus (F) will diverge or converge depending on the type of lens.
- A ray passing parallel to the principal axis will either converge to the focus (in a convex lens) or appear to diverge from the focus (in a concave lens).
- A ray passing through the point 2F will also deviate, as it will either converge or diverge based on the lens type.

5. **Conclusion**: The only condition where the ray will not be deviated is when it passes through the optical center of the lens.

### Final Answer:
The ray will not be deviated when it passes through the optical center of the lens.

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