A) \[{{I}_{1}}/{{I}_{2}}\]
B) \[{{I}_{1}}\times {{I}_{2}}\]
C) \[\sqrt{{{I}_{1}}\times {{I}_{2}}}\]
D) \[\sqrt{{{I}_{1}}/{{I}_{2}}}\]
Correct Answer: C
Solution :
\[\frac{{{I}_{1}}}{O}=\frac{v}{u}\] and \[\frac{{{I}_{2}}}{O}=\frac{u}{v}\Rightarrow {{O}^{2}}={{I}_{1}}{{I}_{2}}\]
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