The cornea and lens of the mammalian eyes are both

Options

A. Transparent and help in image formation on retina
B. Transparent and diverge light rays on retina for image formation.
C. Sensitive and richly supplied by nerves
D. Sensitive and richly supplied by blood vessels.

Answer

To answer the question "The cornea and lens of the mammalian eyes are both," we will analyze the properties and functions of the cornea and lens step by step.

### Step-by-Step Solution:

1. **Identify the Structures**:
- The cornea is the anterior portion of the sclera, which is the outer layer of the eye.
- The lens is a transparent, biconvex structure located behind the iris and pupil.

**Hint**: Remember that the cornea is the front part of the eye, while the lens is located behind the cornea.

2. **Transparency**:
- Both the cornea and the lens are transparent. This transparency is crucial for allowing light to pass through and reach the retina.

**Hint**: Think about why transparency is important for structures in the eye.

3. **Function in Image Formation**:
- The cornea helps to focus light rays entering the eye. It refracts (bends) the light to direct it toward the lens.
- The lens further focuses the light rays onto the retina, allowing for clear image formation.

**Hint**: Consider how both structures work together to direct light to the retina.

4. **Examine Other Options**:
- The second option states they diverge light rays, which is incorrect as both structures focus light.
- The third option mentions sensitivity and nerve supply, which is not the primary function of the cornea and lens.
- The fourth option refers to blood supply, which is also incorrect since the cornea is avascular (lacks blood vessels) and receives nutrients from tears and the aqueous humor.

**Hint**: Evaluate each option critically to determine if it accurately describes the properties of the cornea and lens.

5. **Conclusion**:
- The correct answer is that both the cornea and lens are "transparent and help in image formation on the retina."

### Final Answer:
The cornea and lens of the mammalian eyes are both transparent and help in image formation on the retina.