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What is a Mirror A mirror is most often made with a highly polished surface of a metal, placed behind a glass. A mirror works by refle...
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Herbal plants to grow in home Different types of keerai ----- http://www.indiandietrecipes.com/2016/03/pictures-of-various-types-of-gree...
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What is a Lens A lens is a transparent object that transmits light across it, and its working principle depends on the law of refra...
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