Question

How does the eye lens change its focal length to see nearby objects?

Answer 1

Step 1:

Focal length

The distance between the focus and the mirror or lens is called the focal length.

Step 2:

Change of focal length of the eye lens to see the nearby object because:

1. When the ciliary muscles flex, the curvature of the eye lens increases. As a result, the eye lens thickens.
2. The focal length of the eye lens decreases as it thickens.
3. This enables us to see nearby objects.