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Question

A ray of light travelling in the direction 12(i+3j) is incident on a plane mirror. After reflection, it travels along the direction 12(i3j). The angle of incidence is

A
30
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B
45
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C
60
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D
75
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Solution

The correct option is A 30
In the first diagram,
I=12(i+3j)I=cos60°i+sin60°j
In the second diagram,
R=12(i3j)R=cos60°isin60°jθ=60°
If θ=60°
then α=30°
Angle of incidence=Angle of refelction=α=30°

1179821_952972_ans_35cd656212df4d8e9038b65e92cedd3d.png

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