Given these structures
1. Lens 2. Aqueous humor 3. vitreous humor 4. Cornea
Choose the correct sequence of the pathway of light from outside to inside the eyeball

Options

A. 4, 2, 1, 3
B. 1, 2, 3, 4
C. 4, 3, 2, 1
D. 1, 4, 2, 3

Answer

To determine the correct sequence of the pathway of light from outside to inside the eyeball, we need to analyze the structures provided: Cornea, Aqueous humor, Lens, and Vitreous humor.

### Step-by-Step Solution:

1. **Cornea**: The first structure that light encounters when it enters the eye is the cornea. The cornea is a transparent layer that covers the front of the eye and helps to focus light.

2. **Aqueous Humor**: After passing through the cornea, light travels through the aqueous humor. This is a clear fluid found in the anterior chamber of the eye, which provides nutrients to the eye and maintains intraocular pressure.

3. **Lens**: Next, the light passes through the lens. The lens is a transparent structure that further focuses the light onto the retina. It adjusts its shape to help focus on objects at various distances.

4. **Vitreous Humor**: Finally, the light travels through the vitreous humor, which is a gel-like substance that fills the space between the lens and the retina. It helps maintain the shape of the eye and supports the retina.

### Correct Sequence:
The correct sequence of the pathway of light from outside to inside the eyeball is:
**Cornea (4) → Aqueous Humor (2) → Lens (1) → Vitreous Humor (3)**

Thus, the answer is **4, 2, 1, 3**.