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JEE Main 8 Jan 2020 Shift 2 Solved Paper
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© examsnet.com
Question : 67
Total: 75
The mirror image of the point (1,2,3) in a plane is
(
−
7
3
,
−
4
3
,
−
1
3
)
Which of the following points lies on this plane ?
(-1, -1, -1)
(-1, -1, 1)
(1, 1, 1)
(1, -1, 1)
Validate
Solution:
Point on plane
R
(
−
2
3
,
1
3
,
4
3
)
Normal vector of plane is
10
3
^
i
+
10
3
^
j
+
10
3
^
k
Equation of require plane is
x
+
y
+
z
=
1
Hence (1, -1, 1) lies on plane
© examsnet.com
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