1.

The size of image of an object by a convex lens of focal length 20 cmis observed to be reduced to rd of its size. Find the distance of theobject from the optical centre of the lens.

Answer»

Magnification = 1/3

1/3 = -v/u u/3 = v

mirror formula

1/f = 1/v + 1/u sub v in formula

1/-20 = 3/u + 1/u 1/-20 = 4/u 1/u = 1/-80 u=-80



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