Q. 6 :- The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?
Answer:-
A concave lens is required to correct a myopic vision .
Also, given, far point of a myopic person, f = 80 cm = 0.8 m
| 1 | ||||
| Power | = − |
|
(in metre) | |
| Far point (f) | ||||
| 1 | ||||
| P | = − |
|
D | |
| 0.8 | ||||
| 10 | ||||
| P | = − |
|
D | |
| 8 | ||||
| f | = | 1.25 | D | |