JEE Advanced2017MathematicsEllipseActual
Columns 1, 2 and 3 contain conics, equations of tangents to the conics and points of contact, respectively. Column 1 Column 2 Column 3 (I) x 2 + y 2 = a 2 (i) m y = m 2 x + a (P) a m 2 , 2 a m (II) x 2 + a 2 y 2 = a 2 (ii) y = m x + a m 2 + 1 (Q) - m a m 2 + 1 , a m 2 + 1 (III) y 2 = 4 a x (iii) y = m x + a 2 m 2 - 1 (R) - a 2 m a 2 m 2 + 1 , 1 a 2 m 2 + 1 (IV) x 2 - a 2 y 2 = a 2 (iv) y = m x + a 2 m 2 + 1 (S) - a 2
Options
- A(II) (ii) (Q)
- B(III) (i) (P)
- C(I) (ii) (Q)
- D(I) (i) (P)
Correct answer
C. (I) (ii) (Q)
Step-by-step solution
For a =   2 and point ( - 1 ,   1 ) only I of column-1 satisfies. Hence, equation of tangent is - x + y = 2 or y = x + 2     ⇒     m = 1 which matches with (ii) of column 2 and also with Q of column 3