Pair of Tangents, Chord of Contact and Chord with Midpoint of an Ellipse

IMPORTANT

Pair of Tangents, Chord of Contact and Chord with Midpoint of an Ellipse: Overview

This topic covers concepts, such as Properties of Conjugate Diameters of an Ellipse, Chord of Contact to an Ellipse, Diameter of an Ellipse, Equation of the Polar of a Point with Respect to an Ellipse, Conjugate Diameters of an Ellipse, etc.

Important Questions on Pair of Tangents, Chord of Contact and Chord with Midpoint of an Ellipse

EASY
IMPORTANT

Tangents are drawn to the ellipse x2a2+y2b2=1 at points where it is intersected by the line lx+my+n=0. Find the point of intersection of tangents at these points.

MEDIUM
IMPORTANT

Find the equation of the diameter of an ellipse 2x2+3y2=6 conjugate to the diameter 3y+2x=0

MEDIUM
IMPORTANT

Find the equation of the diameter of an ellipse 3x2+4y2=5 conjugate to the diameter y+3x=0

EASY
IMPORTANT

The line 2x+y=3 intersects the ellipse 4x2+y2=5 at two points. The tangents to the ellipse at these two points intersect at the point.

HARD
IMPORTANT

From any point on the line t+2x+y=1, t-2, tangents are drawn to the ellipse 4x2+16y2=1. It is given that chord of contact passes through a fixed point. Then the number of integral values of 't' for which the fixed point always lies inside the ellipse is

HARD
IMPORTANT

Which of the following options is most revalent?

Statement 1:
Let P be any point on a directrix of an ellipse. Then, the chords of contact of the point P with respect to the ellipse and its auxiliary circle intersect at the corresponding focus.

Statement 2: 
The equation of the family of lines passing through the point of intersection of lines L1=0 and L2=0 is L1+λL2=0.

HARD
IMPORTANT

 If tangent to parabola y2=4x intersect the ellipse x24+y29=1 at A and B and locus of point of intersection of tangents at A and B is a conic C, then

HARD
IMPORTANT

If line x+y=1 is intersecting ellipse x23+y24=1 at two distinct points A and B, then point of intersection of tangents at A and B :

 

MEDIUM
IMPORTANT

From the point P3,4 pair of tangents PA and PB are drawn to the ellipse x216+y29=1. If AB intersects y-axis at C and x-axis at D, then OC·OD is equal to (where O is the origin)

HARD
IMPORTANT

Let from a point Ah,k chords of contact are drawn to the ellipse x2+2y2=6 where all these chords touch the ellipse x2+4y2=4. Then, the perimeter (in units) of the locus of point A is

MEDIUM
IMPORTANT

The line 2x+y=3 interesects the ellipse 4x2+y2=5 at two points. The point of intersection of the tangents to the ellipse at these points is

HARD
IMPORTANT

If the point of intersection of the ellipses x2a2+y2b2=1 and x2α2+y2β2=1 be at the extremities of the conjugate diameters of the former, then -

HARD
IMPORTANT

Tangents are drawn from the points on the line x - y - 5=0 to x2+ 4y2=4 , then all the chords of contact pass through a fixed point, whose co-ordinates are -

HARD
IMPORTANT

The length of the diameter of the ellipse x225+y29=1 perpendicular to the asymptotes of the hyperbola x216-y29=1 passing through the first and third quadrant is

HARD
IMPORTANT

The chord of contact of the tangents drawn from (α,β) to an ellipse x2a2+y2b2=1 touches the circle x2+y2=c2, then the locus of (α,β) is

MEDIUM
IMPORTANT

The chord of contact of the tangents drawn from (α, β) to an ellipse x2a2+y2b2=1 touches the circle x2+y2=c2, then the locus of (α, β) is:

HARD
IMPORTANT

If the chords of constant of tangents from two points (x1,y1) and (x2,y2) to the ellipse x2a2+y2b2=1 are at right angles, then x1x2y1y2 is equal to

HARD
IMPORTANT

If a variable tangent of the circle x2+y2=1 intersects the ellipse x2+2y2=4 at points P and Q, then the locus of the point of intersection of tangent at P and Q is

MEDIUM
IMPORTANT

If 2y=x and 3y+4x=0 are the equations of a pair of conjugate diameters of an ellipse, then the eccentricity of the ellipse is