A) 18
B) 32
C) 64
D) 20
Correct Answer: B
Solution :
For objective-lens\[=\frac{1}{{{f}_{0}}}=\frac{1}{{{v}_{0}}}-\frac{1}{{{u}_{0}}}\] \[\Rightarrow \] \[\frac{1}{(+4)}=\frac{1}{{{v}_{0}}}-\frac{1}{(-4.5)}\] \[\Rightarrow \] \[{{v}_{0}}=36\,\,cm\] \[\therefore \] \[|{{m}_{D}}|=\frac{{{v}_{0}}}{{{u}_{0}}}\left( 1+\frac{D}{{{f}_{e}}} \right)=\frac{36}{4.5}\left( 1+\frac{24}{8} \right)=32\]
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