A) 1.2m
B) 2.4m
C) 2.1m
D) 2.2m
Correct Answer: A
Solution :
For surface P, we have \[\frac{1}{v}=\frac{1}{f}-\frac{1}{u}\] \[=\frac{1}{2}-\frac{1}{4}=\frac{1}{4}\] or \[{{v}_{1}}=4m\] For surface Q, we have \[{{v}_{2}}=\frac{1}{2}-\frac{1}{7}=\frac{5}{14}\] Or \[{{v}_{2}}=\frac{14}{5}=2.8\,m\] Therefore, \[{{v}_{1}}-{{v}_{2}}=(4-2.8)=1.2\,m\]
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