Statement 1: If the extremities of the latus rectum of the ellipse x2a2+y2b2=1 (a> b), having positive ordinates lies on the parabola x2=−2(y−2), then, a=2Statement 2: If the length of the latus rectum of the ellipse x2a2+y2b2=1 is equal to the distance between the foci, then the eccentricity e of the ellipse satisfies e2+e−1=0
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a
STATEMENT- I is True, STATEMENT-2 is True; S TATEMENT-2 is a correct explanation for STATEMENT-
b
STATEMENT-I is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT- I
c
STATEMENT-I is True, STATEMENT-2 is False
d
STATEMENT-I is False, STATEMENT-2 is True
answer is B.
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Detailed Solution
Statement-2 is true by definition of conjugate diameters. Let y=mx and y=m′x x be two conjugate diameters ofthe ellipse x2a2+y2b2=1. Let (h,k) be the mid point of chord whose step is m then hxa2+kyb2−1=h2a2+k2b2−1⇒m=−b2a2hk⇒ Locus of (h, k) is y=−b2a2mx⇒−b2a2m=m′⇒m′m=−b2a2 . (using statement-2)and thus statement- I is false.