First slide

The lens

Question

The focal length of convex lens is 30 cm and the size of image is quarter of the object, then the object distance is

Moderate

A

150 cm
B

60 cm
C

30 cm
D

40 cm

Solution

$m = \frac{f}{f + u} \Rightarrow - \frac{1}{4} = \frac{30}{30 + u} \Rightarrow u = - 150 cm$

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