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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