What is meant by the term ‘power of accommodation’ of human eye? How does it help a person to see nearby as well as distant objects clearly?
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The term 'Power of accommodation' of human eye refers to the ability of an eye to change the focal length of the eye lens. ... But to focus on nearby objects the ciliary muscles contract making the eye lens thick. As a result the focal length of the eye lens decreases and we see the nearby objects.
Explanation:
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Explanation:
What is meant by the term ‘power of accommodation’ of human eye?
ans:- The ability of the eye lens to adjust its focal length, to clearly focus rays coming from distant as well a near object on the retina, is called the power of accommodation of the eye.
The eye lens of humans is transparent and crystalline. It is biconvex and responsible for focussing light on the retina. It is present behind the cornea and attached to the ciliary body by ligaments. Biconvex lens is the simple lenses which comprise two convex surfaces in spherical form, generally having the same kind of radius of curvature. These are also called a convex-convex lens.
How does it help a person to see nearby as well as distant objects clearly?
ans:- When we see the nearby object, the ciliary muscles contract, it increases the thickness of eye lens. The eye lens then becomes thicker. As a result, the focal length of eye lens decreases in such a way that the clear sharp image of nearby object is formed on the retina. Thus, the object is seen clearly to us.
When we see the distant object, these muscles becomes relaxed, thus the eye lens becomes thinner, and consequently focal length of the lens increases. Therefore, the parallel rays coming from the distant object are focused on the retina and object is seen clearly to us. Thus, the accommodation power of an eye helps a person to see nearby as well as distant objects clearly.
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