Question

Why convex lens of small focal length preferred for a magnifying glass. ? ​

Answer 1

Answer: they are to be used to form larger and erect image and small focal length is taken to obtain this .

Explanation:

Answer 2

QUESTION:

Why convex lens of small focal length preferred for a magnifying glass ?

ANSWER:

Magnifying glasses are used to get an enlarged image of a nearby object. So using one with larger focal length is not applicable as the object should be placed at larger distance. So those magnifying glasses with smaller focal length are preferred.

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