A) \[\frac{{{f}_{1}}+{{f}_{2}}}{2}\]
B) \[\sqrt{{{f}_{1}}}{{f}_{2}}\]
C) \[\frac{{{f}_{1}}{{f}_{2}}}{{{f}_{1}}+{{f}_{2}}}\]
D) \[\frac{{{f}_{1}}{{f}_{2}}}{{{f}_{1}}-{{f}_{2}}}\]
Correct Answer: C
Solution :
When\[{{f}_{1}}\]and\[{{f}_{2}}\]are focal lengths of lenses combined together, image formation takes place as follows,You need to login to perform this action.
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