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