1.

(e) Find the power of a convex lens which forms a real and inverted innage of magnification-1 ofan object placed at a distance of 20 cm from its optical centre

Answer» <p>-1 = v/uv= - × - 20v= 20 cm1/f=1/v-1/uf= 10cmSo focal length= 10 cmPower = 1/ f=10diopter</p>


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