Question

why is a normal Eye not able to see clearly the objects placed closer than 25cm

Answer 1

To see closer object, ciliary muscles, must decrease the focal length of eye lens. ... Due to this, a normal eye is not able to see clearly the objects placed closer than 25 cm. This distance at which objects can be seen is clearly, is called the least distance of distinct vision or the near point of the eye.

Answer 2

hii mate...

here's ur answer

as per our eye's structure , our eye's DISTANCE OF DISTINCT VISION is 25 cm.
I. e our eye can't see objects closer than 25 cm. If one tryst to see those objects the ciliary muscles of our eye has to decrease the focal length of our eye which is not easily done.

hope this helps u...!