JEE MATHEMATICS MCQ: PARABOLA

1 Easy

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Application +4 | -1

Two mutually perpendicular tangent of the parabola

y^2=4 a x

meet the axis at

P_1

and

P_2

. It

S

is the focus of the parabola, then

\frac{1}{S P_1}+\frac{1}{S P_2}

is equal to

View answer and explanation

Correct option: B

\frac{1}{a}

Option B (

\frac{{1}}{{a}}

) is correct because it represents the sum of the reciprocals of the distances from the focus to the points where mutually perpendicular tangents meet the axis.

More Questions from PARABOLA

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The equation of a common tangent to the parabolas

y=x^2

and

y=-(x-2)^2

is A point

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

, is Let

P,Q,R

be three points on parabola

{y^2} = 4x

and normal at

P

and

R

meet at

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

is If

I

denotes the semi-latusrectum of the parabola

{y^2} = 4ax

and

SP

and

SQ

denote the segments of any focal chord

PQ,S

being the focus, then

SP,l

and

SQ

are in the relation