Numerical

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?

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#### Solution

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.

Concept: Power of a Lens

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