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Why is a normal eye not able to see clearly the objects placed closer than 25 cm?

Q.8.    Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
 

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A normal eye is not able to see clearly the objects placed closer than 25 cm because the ciliary muscles have a limit of contraction and relaxation, to see closer objects, ciliary muscles, must decrease the focal length of the eye lens.

However, the focal length of the eye lens cannot be decreased below a certain minimum limit.

Due to this, our eyes are not able to see objects clearly when placed closer than 25cm.

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