अवतल दर्पणों के उपयोग।
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Mirrors are also used in optical and scientific apparatus such as telescopes, lasers, cameras, periscopes, and industrial machinery. The terms "mirror" and "reflector" can be used for objects that reflect any other types of waves. An acoustic mirror reflects sound waves.
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nazar ke chasme me door drashti dosh me upyog kiya jata h.
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