Explain the structure and functioning of human eye. How are we able to see nearby as well as distant objects?

Explanation

### Step-by-Step Solution:

**1. Structure of the Human Eye:**
- The human eye is made up of several important parts:
- **Cornea:** The transparent front part of the eye that collects light rays. It is responsible for about 80% of the refraction (bending) of light entering the eye.
- **Pupil:** The opening through which light enters the eye. The size of the pupil is controlled by the iris.
- **Iris:** The colored part of the eye that surrounds the pupil. It regulates the amount of light that enters the eye by adjusting the size of the pupil.
- **Lens:** Located behind the pupil, the lens further refracts light rays and focuses them onto the retina. It can change shape to focus on objects at different distances.
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