Optics Question 925
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 infinity
[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} $
BETA
