plane mirror angle of incidence angle of reflection

Image shaped by a plane mirror is as far behind the mirror as the object is in front of it and it is always virtual.If an object is positioned between two plane mirrors disposed at an angle θ, then the number of images formed is n = (360º/θ) – 1.Ĭharacteristics of the Image Formed by a Plane Mirror The reflected ray has thus been rotated through an angle BOP when the mirror is rotated through an angle θ.įor the same incident ray, when the mirror is rotated through an angle, the reflected ray is rotated through twice the angle. Hence the new angle of deviation COP = 2 (α + θ). Here the glancing angle with X’Y’ is (α + O). The same incident ray AO is now reflected along OP. Suppose the mirror is rotated through an angle O to a position X’Y’. We know that the angle of deviation COB = 2α.

Let α be the glancing angle with XY (Figure). Before the mirror has rotated, the angle of incidence is θ as is the angle of reflection.ĭeviation of Light due to Rotation of a Mirror: Let consider al ray of light AO incident on a plane mirror XY at O. Consider a plane-mirror and a fixed incident ray of light reflecting from the surface at an angle θ. The arrowhead indicates the path of light. They travel along the straight line in a similar homogeneous medium and are represented by straight lines with arrowheads. A ray of light is the path along which the lights travel.

Plane mirror angle of incidence angle of reflection