The least distance of distinct vision is
Correct option is C. $$25cm$$
The minimum distance ,at which the objects can be seen most distinctly without strain , is called the least distance of distinct vision.It is also called as near point of the eye.For a young adult with normal vision,the near point is about $$25 cm$$.
The farthest point up to which eyes can see objects clearly is called the far point of the eye.It is infinity for a normal eye.A normal eye can see objects clearly between $$25 cm$$ and infinity.