A) 12.5 cm
B) 25 cm
C) \[\frac{50}{3}cm\]
D) \[18\,cm\]
Correct Answer: B
Solution :
Since there is no parallex, it means that both images (By plane mirror and convex mirror) coinciding each other. According to property of plane mirror it will form image at a distance of 30 cm behind it. Hence for convex mirror u = ? 50 cm, v = + 10 cm By using \[\frac{1}{f}=\frac{1}{v}+\frac{1}{u}\] \[\Rightarrow \,\,\,\frac{1}{f}=\frac{1}{+10}+\frac{1}{-50}=\frac{4}{50}\] \[\Rightarrow \] \[f=\frac{25}{2}cm\] \[\Rightarrow \,\,\,R=2f=25cm.\]You need to login to perform this action.
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