A) -24 cm
B) 24 cm
C) 60 cm
D) 30 cm
Correct Answer: C
Solution :
\[u=-10cm\] \[v=+15cm\] \[f=?\] \[\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\] \[\frac{1}{15}-\frac{1}{10}=\frac{1}{f}=\frac{2}{R}\] \[-\frac{5}{150}=\frac{2}{R}\] \[R=-\frac{300}{5}=-60cm\]You need to login to perform this action.
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