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EAMCET Engineering 2006 Solved Paper
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© examsnet.com
Question : 135
Total: 160
If
b
and
c
are the lengths of the segments of any focal chord of a parabola
y
2
=
4
a
x
, then the length of the semi-latus rectum is :
b
c
b
+
c
b
+
c
2
√
b
c
2
b
c
b
+
c
Validate
Solution:
Since the semi latus rectum of a parabola is the harmonic mean between the segments of any focal chord of the parabola.
∴
l
is the harmonic mean between
b
and
c
.
Hence,
l
=
2
b
c
b
+
c
© examsnet.com
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