Light

Light

REFLECTION OF LIGHT ON DIFFERENT SURFACES:
    The property of bending of a light into the same medium after striking an obstacle is called reflection of light.
Types of Reflection
1) Regular reflection or specular reflection: 
    In case of highly polished surface all the incident parallel rays are reflected to the same new direction. This is called as regular reflection.
2) Irregular or diffused reflection: 
    Most of the surfaces, even if they seem flat, are really quit rough. When parallel light rays falling onto this surface, they are reflected to all sorts of possible new directions. This is called diffused reflection.
   
Some terms related with reflection:
             XY = Plane mirror
                            AO = Incident ray
                            OB = Reflected ray
                            ON = Normal
                            \(\angle\)AON = Angle of incidence = i
                            \(\angle\)NOB = Angle of reflection = r
                            \(\angle\)AOX = Glance angle of incidence = gi
                            \(\angle\)BOY = Glance angle of reflection = gr
                            \(\angle\)BOA’ = Angle of deviation
Laws of reflection:
1.    Angle of incidence is always equal to angle of reflection (i = r)
2.    Incident ray, reflected ray and normal at a point of incidence are lie in the same plane.