A) - 12.8 cm
B) 32 cm
C) 12.8 cm
D) - 32 cm
Correct Answer: A
Solution :
\[\frac{{{f}_{l}}}{{{f}_{a}}}=\left( \frac{_{a}{{\mu }_{g}}-1}{_{l}{{\mu }_{g}}-1} \right)\Rightarrow \frac{{{f}_{l}}}{4}=\frac{(1.4-1)}{\frac{1.4}{1.6}-1}\Rightarrow {{f}_{l}}=-12.8\,cm\]
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