Which of the following parts of the eye is incorrectly matched with its function?

Options

A. Iris - Controls the amount of light entering the eye.
B. Pupil - Light enters the eye through it.
C. Cornea - An image of an object seen is formed on it.
D. Eyelid - Protects eye from dust, flies, rain, etc.

Explanation

To determine which part of the eye is incorrectly matched with its function, we will analyze each option provided in the question.

1. **Iris**: The iris controls the amount of light entering the eye. This statement is correct. The iris is the colored part of the eye surrounding the pupil and it adjusts the size of the pupil to regulate the amount of light that enters the eye.

2. **Pupil**: The pupil is the opening through which light enters the eye. This statement is also correct. The pupil's size changes in response to light levels, allowing more light in when it's dark and less light when it's bright.

3. **Cornea**: The statement says that an image of an object seen is formed on the cornea. This is incorrect. The cornea is a transparent layer that protects the eye and helps to focus light, but the actual image of an object is formed on the retina, not the cornea.

4. **Eyelid**: The function of the eyelid is to protect the eye from dust and other foreign particles. This statement is correct. The eyelids close to shield the eyes from debris and bright light.

Based on this analysis, the part of the eye that is incorrectly matched with its function is the **cornea**, as it does not form images; that function is performed by the retina.

### Summary of the Solution:
- **Iris**: Correctly matched (controls light entry).
- **Pupil**: Correctly matched (light enters through it).
- **Cornea**: Incorrectly matched (does not form images; image is formed on the retina).
- **Eyelid**: Correctly matched (protects the eye).

### Final Answer:
The **cornea** is incorrectly matched with its function.