1.The change in focal length of a eye lens the image of objects at varying distances is done by the action of the: a)pupil b)retina c)ciliary muscles d)blind spot?

Question

Answer

Ciliary Muscle !!! ..It changes the focal length when distance varies ..

Answer

The ciliary muscles is a circular muscle that relaxes or tighten the zonule which help the lens to change the shape for focusing on the object.

Answer

C) is correct answer.
ciliary muscles.

Answer

The ciliary muscles
The change in focal length of the eye lens to form clear images of objects at varying distances is primarily controlled by the action of the ciliary muscles.

The structure of the eye
To understand the role of the ciliary muscles in adjusting the focal length of the eye lens, it is important to understand the structure of the eye. The eye consists of various parts including the cornea, iris, pupil, lens, retina, and ciliary muscles.

The eye lens and its function
The eye lens is a transparent, flexible structure located behind the iris. Its main function is to refract (bend) light rays entering the eye, so that they converge and form a clear image on the retina.

The role of the ciliary muscles
The ciliary muscles are a ring of smooth muscles that surround the lens. These muscles are connected to the lens by a suspensory ligament. When the ciliary muscles contract, they exert a force on the lens, causing it to become thicker and more curved. This is known as accommodation.

Accommodation and near and distant objects
When we look at a nearby object, the ciliary muscles contract, making the lens thicker and increasing its curvature. This increases the refractive power of the lens, allowing it to focus the light rays from the nearby object onto the retina, forming a clear image. This process is called accommodation for near vision.

On the other hand, when we look at a distant object, the ciliary muscles relax, causing the lens to become thinner and less curved. This decreases the refractive power of the lens, allowing it to focus the light rays from the distant object onto the retina, forming a clear image. This process is called accommodation for distant vision.

Importance of ciliary muscles
The ciliary muscles play a crucial role in adjusting the focal length of the eye lens, allowing us to see clearly at various distances. Without the action of the ciliary muscles, the eye lens would remain in a fixed position, and we would not be able to focus on objects at different distances.

In conclusion, the change in focal length of the eye lens to form clear images of objects at varying distances is primarily controlled by the action of the ciliary muscles. These muscles contract and relax to adjust the thickness and curvature of the lens, allowing it to focus light rays onto the retina and form clear images.

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