What is a magnifying glass ? State its two uses.

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Solution

Magnifying glass is a convex lens of short focal length. It is mounted in a lens holder for practical use.
It is used to see and read the small letters and figures.
It is used by watch makers to see the small parts and screws of the watch.

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The smaller the focus of a convex lens, more its magnifying capacity, so why don't we use magnifying glasses with very small focal length?

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