Q.

C is the centre of the ellipse x2a2+y2b2=1 and 

L is an end of a latusrectum. If the normal at
L meets the major axis at G then CG = 

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a

ae3

b

2ae2ae

c

a2e2

d

ae

answer is C.

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Detailed Solution

Question Image

L(ae, b2a) normal at L is a2 xae-b2 yb2a=a2-b2 axe-ay=a2 e2 it meets x-axis at G put y=0  then x=ae3 G(ae3, 0) CG=ae3

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C is the centre of the ellipse x2a2+y2b2=1 and L is an end of a latusrectum. If the normal atL meets the major axis at G then CG =