Variation of focal length to form a sharp image on retina is calleda)accommodationb)aperturec)retina controld)sutterCorrect answer is option 'A'. Can you explain this answer?

Question

Answer

The ability of the eye in terms of variation of the focal length to form sharp images on the retina is called accommodation.

In simpler terms, the ability of the eye to change the focus from a near distance or a far distance is called accommodation of the eye.
It is possible because of the lens which changes its shape. This makes it possible for the eye to keep focus on an object even when its distance from the eye changes.

Answer

Accommodation is the process by which the vertebrate eye changes optical power to maintain a clear image or focus on an object as its distance varies. focal length is adjusted for a clear image. so,the ans is op A .

Answer

Accommodation:
Accommodation is the process by which the eye changes its focal length to form a sharp image on the retina. This is achieved by varying the shape of the lens inside the eye. When we look at objects at different distances, the ciliary muscles surrounding the lens contract or relax, causing the lens to change its shape. This change in shape alters the focal length of the lens, allowing us to focus on objects at varying distances.

Importance of Accommodation:
Accommodation is crucial for clear vision at different distances. Without accommodation, the image formed on the retina would be blurred, making it difficult to see objects clearly. By adjusting the focal length of the lens, the eye can focus light rays from objects at different distances onto the retina, creating a sharp image.

Factors affecting Accommodation:
Several factors can affect the ability of the eye to accommodate. These include age, eye conditions such as presbyopia, and certain medical conditions. As we age, the flexibility of the lens decreases, making it harder for the eye to accommodate. This is why many older individuals require reading glasses to assist with close-up vision.

Conclusion:
Accommodation is a vital process that allows the eye to focus on objects at varying distances. By adjusting the focal length of the lens, the eye can form a sharp image on the retina, enabling clear vision. Understanding accommodation is important for maintaining good eye health and vision.

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