A) \[\sqrt{\left( {{A}_{1}}{{A}_{2}} \right)}\]
B) \[\left( {{A}_{1}}{{A}_{2}} \right)/2\]
C) \[\frac{{{\left( \sqrt{{{A}_{1}}}+\sqrt{{{A}_{2}}} \right)}^{2}}}{2}\]
D) \[{{\left[ \frac{l}{{{A}_{1}}}+\frac{l}{{{A}_{2}}} \right]}^{-1}}\]
Correct Answer: A
Solution :
[a] By displacement method, the size of object is given by\[O=\sqrt{{{I}_{1}}\times {{I}_{2}}};\] \[\therefore \]\[A\sqrt{{{A}_{1}}\times {{A}_{2}}}\]
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