A) 200 cm
B) 160 cm
C) 2.5 cm
D) 0.1 cm
Correct Answer: C
Solution :
If nothing is said then it is considered that final image is formed at infinite and \[{{m}_{\infty }}=\frac{({{L}_{\infty }}-{{f}_{o}}-{{f}_{e}})\ .D}{{{f}_{o}}{{f}_{e}}}\underline{\tilde{\ }}\frac{LD}{{{f}_{0}}{{f}_{e}}}\] \[\Rightarrow 400=\frac{20\times 25}{0.5\times {{f}_{e}}}\Rightarrow {{f}_{e}}=2.5\ cm.\]
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