gaokao 2018 Q11

gaokao · China · national-II-arts 5 marks Conic sections Eccentricity or Asymptote Computation
Let $F _ { 1 } , F _ { 2 }$ be the two foci of ellipse $C$. $P$ is a point on $C$. If $P F _ { 1 } \perp P F _ { 2 }$ and $\angle P F _ { 2 } F _ { 1 } = 60 ^ { \circ }$, then the eccentricity of $C$ is
A. $1 - \frac { \sqrt { 3 } } { 2 }$
B. $2 - \sqrt { 3 }$
C. $\frac { \sqrt { 3 } - 1 } { 2 }$
D. $\sqrt { 3 } - 1$
Let $F _ { 1 } , F _ { 2 }$ be the two foci of ellipse $C$. $P$ is a point on $C$. If $P F _ { 1 } \perp P F _ { 2 }$ and $\angle P F _ { 2 } F _ { 1 } = 60 ^ { \circ }$, then the eccentricity of $C$ is\\
A. $1 - \frac { \sqrt { 3 } } { 2 }$\\
B. $2 - \sqrt { 3 }$\\
C. $\frac { \sqrt { 3 } - 1 } { 2 }$\\
D. $\sqrt { 3 } - 1$