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Physics
Physics
Problem
Which one of the following correctly states the law of reflection for a plane mirror? a)
i
+
r
=
90
∘
i + r = 90^{\circ}
i
+
r
=
9
0
∘
b)
i
=
r
i = r
i
=
r
c)
i
=
2
r
i = 2r
i
=
2
r
d)
i
+
r
=
180
∘
i + r = 180^{\circ}
i
+
r
=
18
0
∘
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