NTA Abhyas JEE Main2020MathematicsParabolaPractice

The length of the focal chord of the parabola y 2 = 4 x at a distance of 0.4 units from the origin is

Options

A22 units
B23 units
C24 units
D25 units

Correct answer

D. 25 units

Step-by-step solution

Let, P Q is a focal chord and S is the focus Now, O S = 1 ⇒ In Δ O S R ( R is the foot of the perpendicular from O on P Q ) ⇒ c o s e c θ = 1 0 . 4 = 2 . 5 Length of P Q is equal to the length of latus rectum × c o s e c 2 θ ⇒ P Q = 4 2.5 2 = 4 × 6.2 5 = 2 5

Practice Parabola on Quantrex Academy →

More from Parabola

Let T be the tangent to the parabola y^2 = 16x at the point (64, 32) . Let L be the tangent to the same parabola at another point (x₁, y₁) on the parabola. If L and T are perpendic 2026 Let O be the vertex of the parabola y^2=4x and its chords OP and OQ are perpendicular to each other. If the locus of the mid-point of the line segment PQ is a conic C, then the len 2026 Let chord PQ of length 3 13 of the parabola y^2 = 12x be such that the ordinates of points P and Q are in the ratio 1:2 . If the chord PQ subtends an angle at the focus of the para 2026 Let the point P be the vertex of the parabola y = x^2 - 6x + 12 . If a line passing through the point P intersects the circle x^2 + y^2 - 2x - 4y + 3 = 0 at the points R and S , th 2026 Let the directrix of the parabola P: y^2 = 8x , cut x -axis at the point A . Let B( , ) , > 1 , be a point on P such that the slope of AB is 3/5 . If BC is a focal chord of P , the 2026 Let A,B and C be the vertices of a variable right angled triangle inscribed in the parabola y^2=16x . Let the vertex B containing the right angle be (4,8) and the locus of the cent 2026 Consider the parabola P : y^2 = 4kx and the ellipse E : x^2 a^2 + y^2 b^2 = 1 . Let the line segment joining the points of intersection of P and E , be their latus rectums. If the 2026 Let the parabola y = x^2 + px + q passing through the point (1, -1) be such that the distance between its vertex and the x -axis is minimum. Then the value of p^2 + q^2 is: 2026 Full Parabola list All NTA Abhyas JEE Main PYQs