Question

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 ​

Answer 1

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.