Draw an ellipse with distance of the focus from the dirctrix 50 mm and eccentricity as 2/3 also draw normal and tangent at any point of curve
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Answer:
Distanceofdirectrixfromcentre=
c
a
wehave
e=
2
1
e
a
−ae=8
⇒2a−
2
a
=8
∴a=
3
16
e=
1−
a
2
b
2
=
2
1
=
1−
9
256
b
2
&b=
3
8
∴2b=
3
16
Hence,optionDisthecorrectanswer.
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