What is the range of vision of a normal human eye ?
A person is able to see objects clearly only when these are lying at distances between 50 cm and 300 cm from his eye. (a) What kind of defects of vision is he suffering from? (b) What kind of lenses will be required to increase his range of vision from 25 cm to infinity? Explain briefly.
What do you mean by range of vision ?
An optical instrument , in general, extends our range of vision by
(a) What is monocular vision and binocular vision ? Name the animals where such vision is there. (b) What is colour vision ?
