The minimum distance of clear vision for a normal healthy eye of human being is supposed to be

Correct answer: (d) 25 cm

Explanation

The least distance of distinct vision (D) is the closest distance at which a normal eye can see an object clearly without strain.

For a healthy human eye this value is 25 cm; objects nearer than this appear blurred.

The eye cannot focus comfortably at 10 cm or 15 cm, while 50 cm is well beyond the near point.