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How will you distinguish between a plane...

How will you distinguish between a plane mirror, a convex mirror and a concave mirror without touching them?

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Keep the two lense side by side on any printed page. Look for image of printing on the page through each lens. The lens through which printing appears enlarged is convex and the lens through which printing appears shrunk (i.e., smaller) is concave.
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  15. A concave mirror of focal length 20 cm is to be used as a shaving mirr...

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  18. A man standing in front of a special mirror finds his image having a s...

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