First slide

The lens

Question

At what distance from a convex lens of focal length 30 cm, an object should be placed so that the size of the image be 1/2 of the object

Moderate

A

30 cm
B

60 cm
C

15 cm
D

90 cm

Solution

$m = - \frac{1}{2} ∴ m = \frac{f}{u + f} \Rightarrow - \frac{1}{2} = \frac{30}{u + 30} \Rightarrow u = - 90 cm$

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