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1. (a) What is meant by power of a lens ? Define its S.I. unit.(b) You have two lenses A and B of focal lengths +10 em and-10 em respectively.State the nature and power of each lens. Which of the two lenses will form a virtualand magnified image of an objeet placed 8 em from the lens ? Draw a ray diagramto justify your answer.ur of a lrns is defined as the reciprocal of its focal length. It is

Answer»

Thepower of a lensis the reciprocal ofitsfocal length in meters. It is represented by the letter P. ThepowerP of alensof focal length f is given by f = 1/P. TheSI unitofpoweris dioptre .



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