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Question

A person needs a lens of power 2.5 D for correcting his vision. What is the defect of vision that the person is suffering from? Also, find the focal length of the lens.

A
Hypermetropia, 0.4 m
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B
Myopia, 0.4 m
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C
Myopia, 0.4 m
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D
Hypermetropia, 0.4 m
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Solution

The correct option is C Myopia, 0.4 m
Power, P=1f (in m)
The power and focal length of the convex lens is positive and that of the concave lens is negative. Here, the power of the lens is 2.5 D, so it is a concave lens.

Concave lens is used to rectify myopia. Therefore, the defect of vision with which the person is suffering from is myopia.

Power of lens is:
P=1f
f=1P
f=12.5=0.4 m

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