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Question

In an ellipse the length of minor axis is equal to the distance between the foci, the length of latus rectum is 10 and e=12. Then the length of semi major axis is:

A
16
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B
18
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C
10
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D
22
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Solution

The correct option is C 10
Given, length of the minor axis = distance between foci
2b=2ae
2b2a=10.:e=12
a=b2
2b2b2=10
b=52
a=10
Length of semi major axis =10

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