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  4. An ellipse has semi major axis of length 2 and semi minor axis of length 1 . The distance between its foci is

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Q. An ellipse has semi major axis of length 2 and semi minor axis of length 1 . The distance between its foci is

Conic Sections

Solution:

We have $d=F_1 F_2=2 a e$
$d^2=4 a^2 e^2=4\left(a^2-b^2\right)=4(4-1)=12 \Rightarrow d=2 \sqrt{3}$