Optics Question 905
Question: An object of size $ 7.5cm $ is placed in front of a convex mirror of radius of curvature $ 25cm $ at a distance of $ 40cm. $ The size of the image should be
Options:
A) $ 2.3cm $
B) $ 1.78cm $
C) $ 1cm $
D) $ 0.8cm $
Show Answer
Answer:
Correct Answer: B
Solution:
By using $ \frac{I}{O}=\frac{f}{f-u} $
$ \Rightarrow \frac{I}{+(7.5)}=\frac{(25/2)}{( \frac{25}{2} )-(-40)}\Rightarrow I=1.78\ cm $
