Question

The power of lens is -4.0 D. What is the nature of lens? Please answer it fast i need it fast.....please

Answer 1

If the power of lens is -4.0 D, the lens is concave.

Explanation:

• Usually, the positive focal length indicates the person has a long-sightedness and the lens used to rectify the disability is a convex lens.

• The negative focal length indicates the person has a short-sightedness and the lens used to rectify the disability is a concave lens.

• We are given a lens of power –4.0 D which is a negative power, so the person is having short sightedness and cannot see the far images.

• To rectify this disability the concave lens is used with which it makes the images falls onto the retina.

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