Optics Question 925

Question: A convex mirror has a focal length $ f. $ A real object is placed at a distance $ f $ in front of it from the pole produces an image at

[AFMC 2005]

Options:

A) Infinity

B) $ f $

C) $ f/2 $

D) $ 2f $

Show Answer

Answer:

Correct Answer: C

Solution:

Here focal length $ =f $ and $ u=-f $ On putting these values in $ \frac{1}{f}=\frac{1}{u}+\frac{1}{v} $

$ \Rightarrow \frac{1}{f}=-\frac{1}{f}+\frac{1}{v}\Rightarrow v=\frac{f}{2} $



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