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Q.

Statement 1: A normal to the hyperbola with eccentricity 3, meets the transverse axis and conjugate axis at P and Q respectively. The locus of the mid-point of PQ is a hyperbola with eccentricity 322Statement 2: Eccentricity of the hyperbol 8x2−y2= 8a2 is 322.

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a

STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1

b

STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1

c

STATEMENT-1 is True, STATEMENT-2 is False

d

STATEMENT-1 is False, STATEMENT-2 is True

answer is C.

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Detailed Solution

Equation of the normal at (asec⁡θ,btan⁡θ) to the hyperbola x2a2−y2b2=1 isaxsec⁡θ+bytan⁡θ=a2+b2It meets the axes at La2+b2acos⁡θ,0,M0,a2+b2bcot⁡θ If (h,k) is the mid-point of LM then h=a2+b22acosθ,k=a2+b22bcotθ⇒secθ=2h9a,tanθ=2bk9a2  ∵a2+b2=a2e2=9a2 Eliminating θ, we get 4h281a2-4b2k281a4=1Locus of (h,k) is x281a24-y281a44b2=1which is a hyperbola and its eccentricity1+81a44b2×481a2=1+a2b2=1+1e2-1=1+18=322So statement-1 is true. In statement-2, the eccentricity  is1+8a2a2=3 and the statement-2 is false
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Statement 1: A normal to the hyperbola with eccentricity 3, meets the transverse axis and conjugate axis at P and Q respectively. The locus of the mid-point of PQ is a hyperbola with eccentricity 322Statement 2: Eccentricity of the hyperbol 8x2−y2= 8a2 is 322.