RRB ALP 14th Aug 2018 Shift-3

Question 7

A lens has a power + 2.0 D. The type oflens and its focal length will be ..........

Solution

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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