What is meant by power of a lens? What does its sign (+ve or -ve) indi – InterviewSolution

1.	What is meant by power of a lens? What does its sign (+ve or -ve) indicate? State its S.I. unit. How is this unit related to focal lengths of a lens?
Answer» SOLUTION :(i) ABILITY of lens to converge or diverge the light RAYS. (ii) +ve sign `to` converging lens/convex lens -ve sign `to` diverging lens/ concave lens. (III) S.I. unit - dioptre 1 dioptre = 1/focal length (m)

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