A) 15 cm
B) 10 cm
C) 30 cm
D) 60 cm
Correct Answer: D
Solution :
\[\frac{{{f}_{l}}}{{{f}_{a}}}=\frac{{{(}_{a}}{{\mu }_{g}}-1)}{{{(}_{l}}{{\mu }_{g}}-1)}\]\[\Rightarrow \frac{{{f}_{l}}}{15}=\frac{(1.5-1)}{\left( \frac{1.5}{4/3}-1 \right)}\]\[\Rightarrow {{f}_{l}}=60\,cm\]You need to login to perform this action.
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