A) 12 cm
B) 30 cm
C) 50 cm
D) 60 cm
Correct Answer: C
Solution :
For lens \[u=30\ cm,\ \ f=20\,cm\ \], hence by using \[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\]\[\Rightarrow \]\[\frac{1}{+20}=\frac{1}{v}-\frac{1}{-30}\Rightarrow v=60\ cm\] The final image will coincide the object, if light ray falls normally on convex mirror as shown. From figure it is seen clear that separation between lens and mirror is 60 ? 10 = 50 cm.You need to login to perform this action.
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