Question

why is a normal eye not able to see near 25 cm

Answer 1

The maximum accommodation of a normal eye is at a distance of 25 cm from the

eye. The focal length of the eye lens cannot be decreased below this. Thus an object placed closer than 25 cm cannot be seen clearly by a normal eye.

Answer 2

1) The least distance of distinct/clear vision for human eye is 25cm without any strain on the eye.

2) If the object is kept at the distance less than 25cm the lens cannot adjust its focal length which puts strain on the eye.

Therefore, ur Qs.....