A) 20 mm
B) 10 mm
C) 6 mm
D) 1 mm
Correct Answer: D
Solution :
\[\frac{I}{O}=\frac{f}{f-u}\Rightarrow \frac{I}{2}=\frac{20}{20+20}=\frac{1}{2}\]Þ \[I=1\,mm\]
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