Reflection

Reflection takes place when incoming light strikes the surface of a medium, obstructing some wavelengths which bounce back into the medium from which they originated.

  • The laws of reflection are as follows:
    • The incident ray, the reflected ray and the normal to the surface all lie in the same plane.
    • The angle the incident ray makes with the normal is equal to the angle which the reflected ray makes with the same normal.
    • The reflected ray and the incident ray are on the opposite sides of the normal.
  • Reflection takes place when light is neither absorbed by an opaque medium nor transmitted through a transparent medium.
  • As stated above, an important feature of reflection is that when light reflects off a surface, the angle of incidence of an incoming ray as it approaches the surface is equal to the angle of reflection.
  • If the reflecting surface is very smooth, the reflection of light that occurs is called specular or regular reflection.
  • Specular reflection occurs when light waves reflect off a smooth surface such as a mirror. The arrangement of the waves remains the same and an image of the surfaces of objects that the light has already encountered become visible to an observer.
  • Diffuse reflection takes place when light reflects off a rough surface. In this case, scattering takes place and waves are reflected randomly in many different directions and so no image is produced.
  • Reflection off a surface can take place regardless of the optical density of the medium through which the incident light is propagating or of the medium it bounces off.

Summary

Reflection takes place when incoming light strikes the surface of a medium, obstructing some wavelengths which bounce back into the medium from which they originated.

Reflection takes place when light is neither absorbed by an opaque medium nor transmitted through a transparent medium.

If the reflecting surface is very smooth, the reflection of light that occurs is called specular or regular reflection.

Specular reflection occurs when light waves reflect off a smooth surface such as a mirror. The arrangement of the waves remains the same and an image of objects that the light has already encountered become visible to an observer.

Diffuse reflection takes place when light reflects off a rough surface. In this case, scattering takes place and waves are reflected randomly in all directions and so no image is produced.

https://en.wikipedia.org/wiki/Reflection_(physics)>