A Solar Oven Uses a Parabolic Reflector to Focus the Sun's

Multiple Choice

A solar oven uses a parabolic reflector to focus the sun's rays at a point 5 inches from the vertex of the reflector (see figure) . L = 5 inches ​
Write an equation for a cross section of the oven's reflector with its focus on the positive y axis and its vertex at the origin.

A) ​ $$y = \frac { 1 } { 5 } x ^ { 2 }$$ ​
B) $y = 5 x ^ { 2 }$
C) $y = 20 x ^ { 2 }$ ​
D) $x ^ { 2 } = 20 y$
E) $$x ^ { 2 } = 5 y$$