Optics Question 917

Question: A concave mirror is used to focus the image of a flower on a nearby well $ 120cm $ from the flower. If a lateral magnification of $ 16 $ is desired, the distance of the flower from the mirror should be

[MP PET 1986]

Options:

A) $ 8cm $

B) $ 12cm $

C) $ 80cm $

D) $ 120cm $

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Answer:

Correct Answer: A

Solution:

Let distance $ =u. $ Now $ \frac{v}{u}=16 $ and $ v=u+120 $

$ \therefore \frac{120+u}{u}=16\Rightarrow 15u=120\Rightarrow u=8cm $ .



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