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What is a lens? Distinguish between a co...

What is a lens? Distinguish between a convex lens and a concave lens. Which of the two is a converging lens: convex and lens or concave lens?

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Keep the lens close to some printed matter and see the image of the printed matter through it. If the letters appear enlarged then it is a convex lens and if they appear diminished then It Is a concave lens.
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