Question

Define the distance of distinct vision and give its range.

Answer 1

Distance of distinct vision:

1. The distance of distinct vision is the shortest distance from the eye at which an object appears distinct, i.e., a very clear image of the object is formed.
2. This is approximately 25 cm from the eye.
3. It is represented by the letter $d$.
4. The normal human eye can focus a sharp image of an object on the eye if it is located anywhere between infinity and a point known as the 'Near Point.'