The point (1, 2) is one extremity of focal chord of parabola y2=4x. The length of this focal chord is
A
2
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B
4
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C
6
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D
none of these
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Solution
The correct option is B 4
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