A) 40.4 cm
B) 75 cm
C) 50 cm
D) 80 cm
Correct Answer: C
Solution :
Using lens makers formula \[\frac{1}{f}=(\mu -1)\left( \frac{1}{{{R}_{1}}}-\frac{1}{{{R}_{2}}} \right)\] Here, \[{{R}_{1}}=+\,50\,cm,\,{{R}_{2}}=-50cm,\,\mu =1.5\] \[\frac{1}{f}=(1.5-1)\left( \frac{1}{50}-\frac{1}{(-50)} \right)\] or \[\frac{1}{f}=\frac{1}{50}\] Hence, \[f=50\,cm\]
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