Question

The distance between object and image is 60 cm in front of convex lens of focal length 40cm . Find the position of object and image​

Answer 1

$</p><p>u=−60cm.v=+120cm \: \\ \frac{1}{f} = \frac{1}{u} \\ \frac{1}{f} = \frac{1}{120} - \frac{1}{ - 60} = \frac{1 + 2}{120} \\ m = \frac{u}{v} = \frac{h1}{h0} \\ h1 = ho \times \frac{u}{v} = 5 \times \frac{120}{60} = 2$

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