The curvature of the actor lens can be changed by-

Correct option is B

The correct answer is (b) ciliary muscles
The ciliary muscles play a crucial role in adjusting the curvature of the lens in the eye to focus on objects at varying distances. This process is called accommodation. Here's how it works:

• When focusing on nearby objects: The ciliary muscles contract, causing the lens to become more convex (rounded) to increase its refractive power.
• When focusing on distant objects: The ciliary muscles relax, and the lens flattens, reducing its curvature.

Additional Information:

• Retina: The retina is the light-sensitive layer at the back of the eye where images are formed. It does not influence the lens's curvature.
• Pupil: The pupil is the opening that controls the amount of light entering the eye; it has no role in changing the lens's shape.
• Iris: The iris is the colored part of the eye that adjusts the size of the pupil but does not affect the lens.