A) 17
B) 1
C) 5
D) 9
Correct Answer: A
Solution :
[a] \[\frac{1}{{{f}_{a}}}=(1.5-1)\,\left[ \frac{1}{{{R}_{1}}}-\frac{1}{{{R}_{2}}} \right]\] Lens Maker?s formula \[\frac{1}{{{f}_{e}}}=\left( \frac{1.5}{1.42}-1 \right)\,\left( \frac{1}{{{R}_{1}}}-\frac{1}{{{R}_{2}}} \right)\] \[\Rightarrow \,\,\frac{{{f}_{e}}}{{{f}_{a}}}=\frac{(1.5-1)1.42}{0.08}=\frac{1.42}{0.16}=\frac{142}{16}\,\approx 9\]
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