A) \[\sqrt{\frac{{{f}_{1}}}{{{f}_{2}}}}\]
B) \[\sqrt{\frac{{{f}_{2}}}{{{f}_{1}}}}\]
C) \[\frac{{{f}_{1}}+{{f}_{2}}}{{{f}_{1}}{{f}_{2}}}\]
D) \[\frac{{{f}_{1}}+{{f}_{2}}}{{{f}_{1}}{{f}_{2}}}\]
Correct Answer: C
Solution :
If two thin lenses of focal lengths are placed in contact coaxially, then equivalent focal length of combination is |
Power for the combination is |
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