how are we able to see nearby and far objects clearly?
Answers
The eye lens is composed of a fibrous, jelly like material. Its curvature can be modified to some extent by the ciliary muscles. The change in the curvature of the eye lens can thus change its focal length.
Now let's come to the point...
When the muscles are relaxed the lens become thin . Thus its focal length increases. This enables us to see.distant objects clearly.
When you are looking at the objects closer to eye , the ciliary muscles contract. This increases the curvature of the eye lens. The eye lens become thicker. Consequently the focal length of the eye lens decreases
This enables us to see nearby objects clearly.
Hope u like the answer and.have understood the concept..
Structure of human eye :-
1)Retina:- The image is formed on the retina .Retina convert the light rays into impulses and sending the signal to the brain. so that the image is formed
2)Lens:-The light enters the eye through the thin membrane called the cornea. And the lens refract light with the help of cornea focused on retina. And thus the image creates.
3)optic nerve :- It is mainly responsible for carrying and sending all the signal to the brain
4)Iris:- It is made up of muscles and it control the size of pupil when the light enters
5)Pupil:-Its regulate and control the amount of light entering the eye.
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♠Now a question how can we can see the nearby as well as the distant object.:-
Our lens become thin too see a distant object clearly and the focal length increases. And for seeing near object clearly our lens become thick.
That's what our eyes function
Explanation: