Question

An object 3 cm high is placed at a distance of 20 CM in front of convex lens and focal length 12 cm find the position, nature and size of image formed

Answer 1

u = -20cmf = 12 cmv = ?
1f= 1v-1u112 = 1v-1-201v = 120-1121v 1f= 1v-1u112 = 1v-1-201v = 120-1121v .

magnification = vu = 30-20 = -1.5Image would be real , enlarged and inv.

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