A) 22.5 cm
B) 7.5 cm
C) 30 cm
D) 45 cm
Correct Answer: B
Solution :
\[f=-15\,cm,\] \[m=+2\] (Positive because image is virtual) \[\because \,m=-\frac{v}{u}\Rightarrow v=-2u\]. By using mirror formula \[\frac{1}{-15}=\frac{1}{(-2u)}+\frac{1}{u}\Rightarrow u=-7.5\,cm\]You need to login to perform this action.
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