Question

also tell me importance of magnifying glass

Answer 1

With the help of a magnifying glass we can see the minor means small things etc.
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Answer 2

Magnifying glasses help you see:

1. Small things- It will appear larger. This can happen because the magnifying glass generates a virtual image by making use of your retina as well as the lens in your eyes and which are nearer to the convex lens in the magnifying glass.

I hope it is correct:)