Range of vision for a normal human eye is:
25 cm to infinity
24.5cm to infinity
23cm to 25cm
25cm to 25m
Range of vision for a normal human eye is between its near point and far point i.e, from 25cm to infinity.
The near point of a long-sighted person is 50 cm from the eye. (a) Can she see clearly an object at : (i) a distance of 20 cm ? (ii) at infinity ? (b) To read a book held at a distance of 25 cm, will she need converging or diverging spectacle lenses ?
A person is able to see objects clearly when these are lying at distances between 50 cm and 300 cm from his eye
(a) What kind of defects of vision he is suffering from?
(b) What kind of lenses will he required to increase his range of vision from 25 cm to infinity ? Explain briefly.
Least distance of distinct vision of a normal human eye is 25 cm