. The point (1, 2) is one extremity of focal chord of parabola
y2 = 4x. The length of this focal chord is
D. none of these
Sol: The parabola y2 = 4x. Here a =1 and focus is (1, 0).
The focal chord is ASB. This is clearly latus rectum of parabola, its value = 4.
Hence (B) is the correct answer