Definitions of Various Important Terms
Category : JEE Main & Advanced
(1) Focus : The fixed point is called the focus of the conic-section.
(2) Directrix : The fixed straight line is called the directrix of the conic section.
(3) Eccentricity : The constant ratio is called the eccentricity of the conic section and is denoted by e.
(4) Axis : The straight line passing through the focus and perpendicular to the directrix is called the axis of the conic section. A conic is always symmetric about its axis.
(5) Vertex : The points of intersection of the conic section and the axis are called vertices of conic section.
(6) Centre : The point which bisects every chord of the conic passing through it, is called the centre of conic.
(7) Latus-rectum : The latus-rectum of a conic is the chord passing through the focus and perpendicular to the axis.
(8) Double ordinate : The double ordinate of a conic is a chord perpendicular to the axis.
(9) Focal chord : A chord passing through the focus of the conic is called a focal chord.
(10) Focal distance : The distance of any point on the conic from the focus is called the focal distance of the point.
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