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JEE MATHEMATICS MCQ: PARABOLA

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Application +4 | -1

Let PQ be a focal chord of the parabola

y^2=4 a x

If the tangents to the parabola at

P

and

Q

meet at a point lying on the line

y=2 x+a, a>0

, then the length of chord

P Q

, is

View answer and explanation

Correct option: B

5 a

Option B (

5a

) is correct because, with

t_1t_2 = -1

and the intersection point on

y = 2x + a

, we find

t_1 + t_2 = -1

, leading to

PQ = 5a

.

More Questions from PARABOLA

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The equation of a common tangent to the parabolas

y=x^2

y=-(x-2)^2

P

moves such that slope of one tangent drawn from it to parabola

y^2=16 x

is four times the slope of other tangent, then the length of latus rectum of the conic represented by locus of

P

P,Q,R

be three points on parabola

{y^2} = 4x

P

R

Q

, then the locus of the mid-point of the chord

PR

is a parabola whose vertex is at The tangents at the end points of any chord through

(1,0)

to the parabola

y^2+4 x=8

intersect The focus of the parabola

x^2=-16 y

I

denotes the semi-latusrectum of the parabola

{y^2} = 4ax

SP

SQ

denote the segments of any focal chord

PQ,S

being the focus, then

SP,l

SQ

are in the relation