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ICSE Class 9 Answered

A ray of light strikes a plane mirror so that the reflected ray makes an angle of 20 degree with the incident ray . The mirror is now turned through 15 degree.What are the possible angles between the incident and new reflected ray?
Asked by Rp1298908 | 23 Oct, 2018, 07:12: PM
answered-by-expert Expert Answer
Figure-1 shows the initial position of mirror when the angle between incident and reflected ray is 20º.
Angle of incidence and angle of reflection are equal to 10º .
 
Figure-2 shows the position of mirror when it is rotated an angle 15º anticlockwise.
Now incident angle becomes 25º and angle of reflection also 25º . Hence angle between incident ray and reflected ray is 50º .
 
Figure-3 shows the position of mirror when it is roatated from initial position an angle 15º clockwise direction.
Now normal is rotated towards clockwise direction. Hence angle of incidence is 5º and angle of reflection also 5º.
Hence angle between incident ray and reflected ray is 10º
Answered by Thiyagarajan K | 23 Oct, 2018, 11:02: PM

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