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A convex lens and a concave lens - each havingsame focal length of 25 cm - are put in contact to form acombination of lensesThe power in diopters of thecombination is [2006]

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A convex lens and a concave lens - each havingsame focal length of 25 cm - are put in contact to form acombination of lensesThe power in diopters of thecombination is [2006]






 
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