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Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
Updated On: Jun 21, 2024
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A normal eye is unable to clearly see the objects placed closer than 25 cm because the ciliary muscles of eyes are unable to contract beyond a certain limit.
If the object is placed at a distance less than 25 cm from the eye, then the object appears blurred and produces strain in the eyes.
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When the eye is focused on a closer object, the ciliary muscles are strained and the focal length of the eye-lens decreases. Because of some reason, the eye is not able to decrease the focal length beyond a limit, hence a normal eye is not able to see objects closer than 25 cm.
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