A) 23 cm
B) 25 cm
C) 15 cm
D) 13 cm
Correct Answer: C
Solution :
\[m=\frac{{{v}_{0}}}{{{u}_{0}}}\frac{D}{{{f}_{e}}}=-45\Rightarrow \frac{{{v}_{0}}}{{{u}_{0}}}=-9\] Also \[\frac{1}{{{V}_{0}}}-\frac{1}{{{u}_{0}}}=\frac{1}{{{f}_{0}}}\Rightarrow {{V}_{0}}=10\,cm.\] \[\therefore \]Length of tube \[={{V}_{0}}+{{f}_{e}}=15\,cm.\] Hence, the correction option is (c).You need to login to perform this action.
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