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 vu=16 and v=u+120

∴120+uu=16⇒15u=120⇒u=8cm .

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