Question

a visitor left his spectacles behind.how would you know if he is longsighted or shortsighted by examine the spectacles ​

Answer 1

Answer:

If the spectacles has convex lenses then it means that the person is shortsighted and if the spectacles has concave lenses then it means that the person is longsighted.

Explanation:

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Answer 2

Answer:

By setting The lens.......

Convex= short-sightedness

Concave= long-sightedness.