[BHU 1995; DPMT 2001; MP PMT 2005]
A) 20 cm
B) 40 cm
C) 30 cm
D) 10 cm
Correct Answer: D
$ \frac{1}{F}=\frac{2}{f _{l}}+\frac{1}{f _{m}} $
$ \Rightarrow $ $ \frac{1}{F}=\frac{2}{20}+\frac{1}{\infty }\Rightarrow F=10 $ $ cm $
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