Question

Doctor prescribes lens of power -0.5 D. Then the type of lens and it's focal length is ____.

convex lens , -2m

concave lens, -2m

convex lens, 2m

concave lens,2m​

Answer 1

Answer:

plz mark brainlist

Explanation:

A person suffering from myopia (near-sightedness) can see only nearby objects clearly and it is corrected by using a concave lens. Whereas a person suffering from hypermetropia (long-sightedness) can see only distant objects clearly and it is corrected by using a convex lens.

Thus if a person suffers from both, then he must be using a concave lens to see distant objects and a convex lens to see nearby objects (especially for reading). Hence his spectacles would be made of a concave lens as the upper lens and convex lens as the lower lens.

Answer 2

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concave lens , 2m