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 $
Show Answer
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 $ .
