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Conic Section
For the Hyperbola 
which of the following remains constant when α varies?
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Eccentricity
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Directrix
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Abscissae of vertices
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Abscissae of foci
D.
Abscissae of foci
a2 = cos2α and b2 = sin2α
coordinates of focii are (± ae, 0)
∴ b2= a2(e2– 1) ⇒ e = secα.
Hence abscissae of foci remain constant when α varies.
Some More Questions From Conic Section Chapter
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Mock Test Series
Mock Test Series