A person needs a lens of power $- 4.5 D$ for correction of her vision. What is the nature of the corrective lens?

Concave lens

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Convex lens

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Concave and convex both lens

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none of these

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Solution

The correct option is A Concave lens
Power needed is given in negative and hence the focal length of the corrective lens is negative. Negative focal length is a characteristic of concave lens. So, the nature of the corrective lens is concave lens.

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Noopor needs a lens of power - 4.5D for correction of her vision.

What is the focal lens and the nature of the corrective leans?

Question 18 (a)
A person needs a lens of power –4.5 D for correction of her vision.
What kind of defect in vision is she suffering from?

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