Optics Question 911

Question: The image formed by a convex mirror of focal length $ 30cm $ is a quarter of the size of the object. The distance of the object from the mirror is

Options:

A) $ 30cm $

B) $ 90cm $

C) $ 120cm $

D) $ 60cm $

Show Answer

Answer:

Correct Answer: B

Solution:

$ m=\frac{f}{(f-u)}\Rightarrow ( +\frac{1}{4} )=\frac{(+30)}{(+30)-u}\Rightarrow u=-\ 90\ cm $



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