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A light ray gets reflected from
MATHEMATICS · Single correct · CBSE · Mathematics · Circles · Circles
Problem
A light ray gets reflected from
x
=
−
2
x = -2
x
=
−
2
. If the reflected ray touches the circle
x
2
+
y
2
=
4
x^2 + y^2 = 4
x
2
+
y
2
=
4
and the point of incident is
(
−
2
,
−
4
)
(-2, -4)
(
−
2
,
−
4
)
, then the equation of the incident ray is (1)
4
y
+
3
x
+
22
=
0
4y + 3x + 22 = 0
4
y
+
3
x
+
22
=
0
(2)
3
y
+
4
x
+
20
=
0
3y + 4x + 20 = 0
3
y
+
4
x
+
20
=
0
(3)
4
y
+
2
x
+
20
=
0
4y + 2x + 20 = 0
4
y
+
2
x
+
20
=
0
(4)
y
+
x
+
6
=
0
y + x + 6 = 0
y
+
x
+
6
=
0
Related theory
Geometric Transformations
Circles
Equation of a circle
Coordinate Geometry
Tangent to a Circle
Tangent length properties
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