Question 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:
The person is suffering from an eye defect called myopia. In this defect, the image
is formed in front of the retina. Hence, a concave lens is used to correct this defect
of vision.
Object distance, u = infinity =∞
Image distance, v = −80 cm
Focal length = f
According to the lens formula,
A concave lens of power −1.25 D is required by the person to correct his defect
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