A) \[\frac{R}{2({{\mu }_{1}}+{{\mu }_{2}})}\]
B) \[\frac{R}{2({{\mu }_{1}}-{{\mu }_{2}})}\]
C) \[\frac{R}{({{\mu }_{1}}-{{\mu }_{2}})}\]
D) \[\frac{2R}{({{\mu }_{2}}-{{\mu }_{1}})}\]
Correct Answer: C
Solution :
Focal length of the combination |
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We have ![]() ![]() |
or ![]() |
or ![]() |
Putting these values in Eq. (i), we get |
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