A) 30 cm
B) 60 cm
C) 90 cm
D) 30 cm
Correct Answer: B
Solution :
From lens formula \[\frac{1}{f}=(\mu -1)\,\left( \frac{1}{{{R}_{1}}}-\frac{1}{{{R}_{2}}} \right)\] Given, \[\mu =1.5,\,{{R}_{1}}=60\,cm,\,{{R}_{2}}=-60\,cm\] \[\therefore \] \[\frac{1}{f}=(1.5-1)\,\left( \frac{1}{60}+\frac{1}{60} \right)\] \[\Rightarrow \] \[f=60\,cm\]
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