Which part of the human eye is not transparent in nature?

Options

A. Sclera
B. Cornea
C. Eye lens
D. Pupil

Answer

To answer the question "Which part of the human eye is not transparent in nature?", we can follow these steps:

### Step 1: Identify the Parts of the Human Eye
The human eye consists of several parts, including the sclera, cornea, iris, pupil, and lens.

### Step 2: Determine the Characteristics of Each Part
- **Sclera**: This is the white outer layer of the eyeball. It is opaque and not transparent.
- **Cornea**: This is the front part of the eye and is transparent, allowing light to enter.
- **Iris**: This is the colored part of the eye that surrounds the pupil; it is also not transparent.
- **Pupil**: This is the opening in the center of the iris and is not a solid structure, so it is considered transparent.
- **Lens**: The lens of the eye is transparent and helps to focus light onto the retina.

### Step 3: Identify the Non-Transparent Part
From the analysis, we can conclude that the **sclera** is the part of the human eye that is not transparent. It makes up more than 80% of the surface area of the eyeball and is white in color.

### Conclusion
The part of the human eye that is not transparent in nature is the **sclera**.

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