A) 30 cm
B) 25 cm
C) 15 cm
D) 12 cm
Correct Answer: C
Solution :
By using \[{{m}_{\infty }}=\frac{({{L}_{\infty }}-{{f}_{o}}-{{f}_{e}}).D}{{{f}_{o}}{{f}_{e}}}\] \[\Rightarrow 45=\frac{({{L}_{\infty }}-1-5)\times 25}{1\times 5}\Rightarrow {{L}_{\infty }}=15\,cm\].
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