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 |