Question

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

• A. $2\sqrt{3}$
• B. 3
• C. $2\sqrt{2}$
• D. $\sqrt{3}$

Answer 1

Answer: (A)

We have $d=F_1{F}_2=2ae$
$d^2=4a^2{e}^2=4\left(a^2-b^2\right)=4(4-1)=12\Rightarrow d=2\sqrt{3}$