A) 10
B) 8
C) 5
D) 6
Correct Answer: C
Solution :
Let equation of ellipse\[\frac{{{x}^{2}}}{{{a}^{2}}}+\frac{{{y}^{2}}}{{{b}^{2}}}=1\] \[2a2b=10\] ...(1) \[ae=5\sqrt{3}\] ...(b2 \[\frac{2{{b}^{2}}}{a}=?\] \[{{b}^{2}}={{a}^{2}}(1-{{e}^{2}})\] \[{{b}^{2}}={{a}^{2}}-{{a}^{2}}{{e}^{2}}\] \[{{b}^{2}}={{a}^{2}}-25\times 3\] \[\Rightarrow \]\[b=5\]and \[a=10\] \[\therefore \] length of L.R.\[=\frac{2(25)}{10}=5\]You need to login to perform this action.
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