Question

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

Answer 1

Answer:

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..

.

.

.

.

Stay safe

Answer 2

Answer:

The maximum ‘accommodation’ of a normal eye is reached when the object  is at a distance of about 25cm from the eye.

So, an object placed at a distance of  less than 25cm cannot be seen clearly by a normal eye because all the power of  accommodation has already been exhausted.

Also, the ciliary muscles can not  make the eye lens more thick(convex).

The power of accommodation of the eye  for a person having normal vision is about 4 diopters.

Hence, a normal eye is

not able to see clearly the objects placed closer than 25cm.

Hope it helps you :)