A) \[30\,cm\]
B) \[60\,cm\]
C) \[-60\,cm\]
D) \[-30\,cm\]
Correct Answer: B
Solution :
In first case, \[\frac{1}{15}=(1.5-1)\,\,\,\left( \frac{1}{{{R}_{1}}}-\frac{1}{{{R}_{2}}} \right)\] ?..(i) and in second case, \[\frac{1}{f}=\left( \frac{1.5}{4/3}-1 \right)\,\left( \frac{1}{{{R}_{1}}}-\frac{1}{{{R}_{2}}} \right)\] ??(ii) Dividing equation (i) by equation (ii); we get, \[f=60cm\]You need to login to perform this action.
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