Question

why a normal eyes note able to see clearly the object placed close then 25 CM

Answer 1

To see an object comfortably and distinctly, the distance of object should be at least 25 cm from the eyes. 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

normal eyes not able to see an object placed 25cm because our least distance of distinct vision is 25 cm.

we can see objects which r placed more than 25 cms only.