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Q.

Least distance of distinct vision of a person is observed as 35 cm. The lens is useful for him to see his surroundings clearly is [[1]]. 

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answer is CONVEX LENS .

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Detailed Solution

Learn about the anatomy and physiology of the eye. Look into the eye problems we can have. Learn about concave and convex lenses, and then consider which lens might be used to help someone with hypermetropia see well.

According to the question, the individual has hyperopia, a condition in which the strength of the lens of the eyes weakens and makes it difficult to see clearly objects that are right in front of our faces because light rays from the item go through the lens of the eye and collide with the retina.
Convex lenses (with the right power) can be used to remedy these kinds of issues since they force the rays to condense. We can determine the focal length and proper convex lens that are good for the eyes based on the state of the eyes.

Hence, the correct answer is convex lens .

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Least distance of distinct vision of a person is observed as 35 cm. The lens is useful for him to see his surroundings clearly is [[1]].