A) \[10\]
B) \[7.5\]
C) \[5\]
D) \[15\]
Correct Answer: C
Solution :
\[m=30\] \[{{f}_{e}}=5\,cm\] \[m={{m}_{o}}\times {{m}_{e}}\] \[m={{m}_{o}}\times \left( 1+\frac{D}{{{f}_{e}}} \right)\] \[30={{m}_{0}}\left( 1+\frac{25}{5} \right)\Rightarrow {{m}_{o}}=5\]
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