A lens is placed between a lamp and a screen which are 18 cm apart, so that the image on the screen is
three times as large as the lamp. The distance between the lamp and the lens is
(A) 3.2 cm (B) 3.8 cm (C) 4.2 cm (D) 4.5 cm.
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THE LENS IS CONVEX OR CONCAVE
narnderkumar21p6pyxx:
it is not given
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