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Terminology question

 
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Oct5-10, 04:12 AM   #1
 

Terminology question


What is meant by angle between reflected ray and incident ray , the angle of deviation or the sum of angles of incidence and reflection ? ( For a plane mirror )
 
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Oct5-10, 05:06 AM   #2
 
The angle of deviation would be the angle D in the diagram.
It would be equal to 180 - (i+r)
Because r = i for a mirror then it could be expressed as
D = 180 - 2i

So the angle you refer to is 180 - D
 
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