Name the type of the lense if it's power is 2.0 D find the focal length of this lense
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Answer: Focal length f= 1/p So according to the question power is +2.0 D f= 1/2.0 = 0.5 m In centimeter ...the focal length is 50cm. it means that it is biconvex lens having focal length 50 cm.
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