JEE Exam  >  JEE Questions  >  Any point on the parabola whose focus is (0,1... Start Learning for Free
 Any point on the parabola whose focus is (0,1) and the directrix is x + 2 = 0 is given by
  • a)
    (t2 + 1, 2t – 1)
  • b)
    (t2, 2t)
  • c)
    (t2 + 1, 2t + 1)
  • d)
    (t2 – 1, 2t + 1)
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Any point on the parabola whose focus is (0,1) and the directrix is x ...
f(0,1),d(x+2=0)
Distance of any point on parabola and focus is equal to distance of point and directrix.
fP=(h−0)2+(k−1)2= (h2+k2+1−2k)1/2
Distance of point (h,k) and line x+2=0
Using point line distance formula.
dP=h+2
[h2+k2+1−2k]1/2=h+2
h2+k2+1−2k = h2+4+4h
k2−2k+1−4−4h=0
replacing h→x,k→y  y2−2y+1−4−4x=0
(y−1)2=4(x+1)     …(1)
Let Y=y−1,X=x+1 then (1) becomes 
Y^2=4aX2
Here a=1 any point on this parabola will be of the form (at2,2at)=(t2,2at)
⇒X=t2 ⇒x+1=t2
⇒x=t2−1
⇒Y2=2t
⇒y−1 = 2t ⇒ y = 2t+1
∴ Any point on the parabola (y−1)2=4(x+1) is 
= (t2−1,2t+1)
View all questions of this test
Most Upvoted Answer
Any point on the parabola whose focus is (0,1) and the directrix is x ...
Solution:

Given, focus of the parabola is (0, 1) and its directrix is x = 2.

Let P (x, y) be any point on the parabola.

Let perpendicular distance of point P from directrix be d and distance of point P from focus be PF.

Then, by definition of parabola, we know that d = PF.

Let's find the equation of the parabola using the above information.

Let the equation of the parabola be y2 = 4ax.

Since the focus is (0, 1), we have a = 1/4.

Also, since the directrix is x = 2, we have the equation of the directrix as x = -a.

Substituting the value of a, we get x = -1/4.

So, the equation of the parabola is y2 = x + 1/4.

Let P (x, y) be any point on the parabola.

Then, the distance of point P from focus (0, 1) is PF = √(x2 + (y-1)2).

Also, since the directrix is x = 2, the perpendicular distance of point P from directrix is d = |x - 2|.

Since d = PF, we have √(x2 + (y-1)2) = |x - 2|.

Squaring both sides, we get x2 + (y-1)2 = (x-2)2.

Expanding, we get y2 - 2y + 1 = x2 - 4x + 4.

Substituting the value of a, we get y2 = x + 1/4.

Substituting this value in the above equation, we get x + 1/4 - 2y + 1 = x2 - 4x + 4.

Simplifying, we get x2 - 3x - 4y + 15/4 = 0.

This is the required equation of the parabola.

Now, we need to find the point P (x, y) on the parabola that satisfies the given conditions.

Substituting x = t2 - 1 and y = 2t - 1 in the above equation, we get:

(t2 - 1)2 - 3(t2 - 1) - 4(2t - 1) + 15/4 = 0.

Simplifying, we get t2 - 2t + 1 = 0.

Solving for t, we get t = 1.

Substituting t = 1 in x = t2 - 1 and y = 2t - 1, we get P (0, 1).

Therefore, the point on the parabola whose focus is (0, 1) and the directrix is x = 2 is (t2 - 1, 2t - 1) = (1-1, 2-1) = (0, 1).

Hence, the correct answer is option D.
Free Test
Community Answer
Any point on the parabola whose focus is (0,1) and the directrix is x ...
https://doubtnut.com/question-answer/find-the-coordinates-of-any-point-on-the-parabola-whose-focus-is-0-1-and-directrix-is-x-20-38441
Explore Courses for JEE exam
Any point on the parabola whose focus is (0,1) and the directrix is x + 2 = 0 is given bya)(t2+ 1, 2t – 1)b)(t2, 2t)c)(t2+ 1, 2t + 1)d)(t2– 1, 2t + 1)Correct answer is option 'D'. Can you explain this answer?
Question Description
Any point on the parabola whose focus is (0,1) and the directrix is x + 2 = 0 is given bya)(t2+ 1, 2t – 1)b)(t2, 2t)c)(t2+ 1, 2t + 1)d)(t2– 1, 2t + 1)Correct answer is option 'D'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about Any point on the parabola whose focus is (0,1) and the directrix is x + 2 = 0 is given bya)(t2+ 1, 2t – 1)b)(t2, 2t)c)(t2+ 1, 2t + 1)d)(t2– 1, 2t + 1)Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Any point on the parabola whose focus is (0,1) and the directrix is x + 2 = 0 is given bya)(t2+ 1, 2t – 1)b)(t2, 2t)c)(t2+ 1, 2t + 1)d)(t2– 1, 2t + 1)Correct answer is option 'D'. Can you explain this answer?.
Solutions for Any point on the parabola whose focus is (0,1) and the directrix is x + 2 = 0 is given bya)(t2+ 1, 2t – 1)b)(t2, 2t)c)(t2+ 1, 2t + 1)d)(t2– 1, 2t + 1)Correct answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free.
Here you can find the meaning of Any point on the parabola whose focus is (0,1) and the directrix is x + 2 = 0 is given bya)(t2+ 1, 2t – 1)b)(t2, 2t)c)(t2+ 1, 2t + 1)d)(t2– 1, 2t + 1)Correct answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Any point on the parabola whose focus is (0,1) and the directrix is x + 2 = 0 is given bya)(t2+ 1, 2t – 1)b)(t2, 2t)c)(t2+ 1, 2t + 1)d)(t2– 1, 2t + 1)Correct answer is option 'D'. Can you explain this answer?, a detailed solution for Any point on the parabola whose focus is (0,1) and the directrix is x + 2 = 0 is given bya)(t2+ 1, 2t – 1)b)(t2, 2t)c)(t2+ 1, 2t + 1)d)(t2– 1, 2t + 1)Correct answer is option 'D'. Can you explain this answer? has been provided alongside types of Any point on the parabola whose focus is (0,1) and the directrix is x + 2 = 0 is given bya)(t2+ 1, 2t – 1)b)(t2, 2t)c)(t2+ 1, 2t + 1)d)(t2– 1, 2t + 1)Correct answer is option 'D'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Any point on the parabola whose focus is (0,1) and the directrix is x + 2 = 0 is given bya)(t2+ 1, 2t – 1)b)(t2, 2t)c)(t2+ 1, 2t + 1)d)(t2– 1, 2t + 1)Correct answer is option 'D'. Can you explain this answer? tests, examples and also practice JEE tests.
Explore Courses for JEE exam

Top Courses for JEE

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev