A) 12 cm, concave
B) 4 cm, concave
C) 12 cm, convex
D) 4 cm, convex
Correct Answer: C
Solution :
Since, magnified images are obtained at two different positions, so one image must be real and other must be virtual. \[3=\frac{f}{f-16}\] (for virtual) \[-3=\frac{f}{f-8}\] (for real) \[\Rightarrow \] \[f-16=-(f-8)\] \[\Rightarrow \] \[f-16=-f+8\] \[\Rightarrow \] \[2f=24\] \[\therefore \] \[f=+12\,cm\] (convex)You need to login to perform this action.
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