Question

the focal length of aens is 60 cm. What is the nature and power of lens in units
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Answer 1

Answer:

Power of a lens is determined by the formula P=1/f (when focal length is in meters) and P=100/f (when focal length is in centimeters) Here,the power is given as 5 diopters. On equating we get, ⇒5=100/f ⇒f=100/5 =20 cms.