What change is made in the eye to enable it to focus on objects situated at different distances ? Illustrate your answer with the help of diagrams.
Answers
l hope you will understand friend
The limited converging force, however, is sufficient to converge the perpendicular rays of light from the bright object and shape its image at the retina.
Explanation:
(a) The ciliary muscles of both the eye contract while the eye is concentrated on a close object, loosening suspensory muscles and tendons linked to the eye.
- When the ligaments are loose, they stop pulling the lens of the eye which causes the lens of the eye to bulge (or more convex) and increase its converging force.
- The eye lens intersects the diverging light rays from the surrounding object to form its picture on the eye as the diverging power rises.
(b) The ciliary muscles are absolutely relaxed if the eye is concentrated on a distant object. Suspensory ligaments are pulled closely by the relaxed ciliary muscles.
- As the ligaments become strong, they pull the eye lens and makes the eye lens thinner (or more less convex).
- The eye lens focus length is the average but the minimum is its converging capacity.
- The limited converging force, however, is sufficient to converge the perpendicular rays of light from the bright object and shape its image at the retina.
To know more about focus on objects, visit:
The human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This is due to
(a) presbyopia.
(b) accommodation.
(c) near-sightedness.
(d) far-sightedness.
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A far sighted man cannot focus distinctly on objects closer than 1 metre. The power of the lens that will permit him to read from a distance of 40 cm is?
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