1.

Collect information about the lenses available in an optical shop.find focal length of a lens may be determined by the given' power of lens

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there are different types of lenses such as BICONCAVE lens,biconvex lens,planoconvex lens,planoconcave lens,concavoconvex lens and convexoconcave lens.among these we USUALLY FIND biconcave,biconvex and concavoconvex lens in optical shop for myopia,hypermetropia and presbyopia respectively.power of lens p=1/f(in metres) and p=100/f(in CM)Explanation:



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