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Thomson's Discovery of Electrons

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the lengths of focal radii in a parabola with respect to a focal chord are 6 and 12 then the distance between directrix and latus rectum equals 1.8 2.6 3.12 4.20

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Q. Assertion :If

P S Q

is the focal chord of the parabola

y^{2} = 8 x

S P = 6

, then the length

S Q

3

. Reason: The semi-latus rectum of a parabola is the harmonic mean between the segment of any focal chord of a parabola.

b

c

are the lengths of the segments of any focal chord of a parabola

y^{2} = 4 a x

, then length of the semi-latus rectum is

Q. If AFB is a focal chord of the parabola

y^{2} = 4 a x

A F = 4

F B = 5

, then the latus-rectum of the parabola is equal to

If b and c are lengths of the segments of any focal chord of the parabola $y^{2} = 4 a x,$ then write the lengths of its latus-rectum.

2

3

are the lengths of the segments of any focal chord of a parabola

y^{2} = 4 a x

made by the axis of the parabola, then the length of the latus rectum is

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