1.

uital eentre.The size of image of anis observed to be reduced to 1 rd of its size. Find the distance of theobject from the optical centre of the lens.(b)object by a convex lens of focal length 20 cm

Answer»

Magnification = 1/31/3 = -v/u-u/3 = v

Here,u = Object distance v = Image distance

Mirror formula1/f = 1/v + 1/u

Substitute v in formula1/20 = - 3/u + 1/u1/20 = -2/u 1/u = 1/-40 u = - 40

Therefore object distance from optical center is 40 cm



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