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AMU Engineering 2020 solved paper Solved Paper
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© examsnet.com
Question : 140
Total: 150
The eccentricity of the ellipse, if the distance between the foci is equal to the length of the latusrectum, is
√
5
−
1
2
√
5
+
1
4
√
5
−
1
4
√
5
+
1
2
Validate
Solution:
We have,
2
a
e
=
2
b
2
a
⇒
a
2
e
=
b
2
⇒
a
2
e
=
a
2
(
1
−
e
)
2
⇒
e
2
+
e
−
1
=
0
⇒
e
=
√
5
−
1
2
© examsnet.com
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