Angle of Deviation: Plane Mirror Reflection

Thread starter Perpendicular
Start date Oct 5, 2010
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The angle of deviation in a plane mirror is defined as the angle between the reflected ray and the incident ray. It is calculated using the formula D = 180 - (i + r), where r equals i for mirrors. This simplifies to D = 180 - 2i, indicating that the angle of deviation is directly related to the angle of incidence. Therefore, the angle referred to in discussions is 180 - D. Understanding these relationships is crucial for analyzing reflections in optics.

Oct 5, 2010

Perpendicular

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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Oct 5, 2010

Stonebridge

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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