Question

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$a. \: \: which \: is \: the \: thinnest \: blood \: vessel \\ \\ \\ b. \: \: which \: lens \: is \: used \: as \: magnifying \: glass$

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Answer 1

capilaries anre the thinnest blood vessels

convex lens are used as magnifying lens

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Answer 2

Capillaries are the thinnest blood vessel.
Convex lens is used as magnifying glass.