Two mirrors meet at right angles. A ray of light is incident on one end at an angle of 30o as shown in figure. Draw the reflected ray from the second mirror.
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Solution
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At Mirror OA,
Angle of incidence = angle of reflection = 30o
∠CAB=30o
∠CAB+∠CBA+∠ACB=180o
30o+90o+∠ABC=180o
∠ABC=60o
At mirror OB,
Angle of incidence = angle of reflection = 60o
Note that,
AC||OB
Angle between incident ray and AC = Angle between reflected ray and OB =30o
Hence, first incident ray are last reflected ray in this case are parallel.
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