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JEE Advanced 2021 Paper 2
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© examsnet.com
Question : 44
Total: 57
Let
E
denote the parabola
y
2
=
8
x
. Let
P
=
(
−
2
,
4
)
, and let
Q
and
Q
′
be two distinct points on
E
such that the lines
P
Q
and
P
Q
′
are tangents to
E
. Let
F
be the focus of
E
. Then which of the following statements is (are) TRUE?
The triangle
P
F
Q
is a right-angled triangle
The triangle
Q
P
Q
′
is a right-angled triangle
The distance between
P
and
F
is
5
√
2
F
lies on the line joining
Q
and
Q
′
Validate
Solution:
Given that
E
:
y
2
=
8
x
P
=
(
−
2
,
4
)
Point
P
(
−
2
,
4
)
lies on direction of parabola
So,
∠
Q
P
Q
′
=
π
2
and chord
Q
Q
′
is a focal chord and segment
P
Q
subtends right angle at the focus. So,
∠
P
F
Q
=
π
2
Slope of
Q
′
=
2
t
1
+
t
2
=
1
Slope of
P
F
=
−
1
∴
Q
Q
′
⟂
P
F
P
F
=
4
√
2
© examsnet.com
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