The point (1, 2) is one extremity of focal chord of parabola $y^{2} = 4 x$ . The length of this focal chord is

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Solution

The correct option is B 4

The parabola $y^{2} = 4 x$ , here a = 1 and focus is (1, 0)
The focal chord is ASB. This is clearly latus rectum of parabola, its value = 4

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