Q: The angle between the tangents drawn from a point (-a, 2a) to y^{2} = 4ax is

(A) π/4

(B) π/2

(C) π/3

(D) π/6

Sol. The given point (– a, 2a) lies on the directrix x = – a of the parabola y^{2} = 4ax. Thus, the tangents are at right angle.

Hence (B) is the correct answer.