Types of Reflection, Irregular Reflection, Regular Reflection (For CBSE, ICSE, IAS, NET, NRA 2022)

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Types of Reflection

  • Regular Reflection
  • Irregular Reflection

Regular Reflection

  • This type of reflection is produced by the plane mirrors with a smooth surface.
  • In this case, the image is clear and is very much visible.
  • They produced by plane mirrors are always virtual, that is they cannot be collected on a screen.
  • In the case of curved mirrors with a smooth surface, we can see the images of reflection either virtually or really.
  • The images produced by curved mirrors can be either real (collected on a screen and seen) , or virtual (cannot be collected on a screen, but only seen) .

Irregular Reflection

Irregular Reflection
  • Most natural surfaces are rough on the scale of the wavelength of light, and, as a consequence, parallel incident light rays are reflected in many different directions irregularly, or diffusely, unlike the mirrors.
  • So, diffuse reflection helps in seeing the objects and is responsible for the ability to see most illuminated surfaces from any position.
  • In both regular and irregular reflections, the laws of reflection are followed.

Law of Reflection Formula

Law of Reflection Formula

The law of reflection formula is given as:


  • is the angle of incidence
  • is the angle of reflection

Calculation of Angle of Incidence and Angle of Reflection

The angle of incidence and the angle of reflection are calculated by drawing a normal line which is perpendicular to the reflecting surface.

Differences between Regular and Irregular Reflection

Differences between Regular and Irregular Reflection
S. No.Regular ReflectionIrregular Reflection
1It occurs when all the reflected rays from a given smooth surface are parallel for parallel incident rays.It occurs when for a given set of incident parallel rays, the reflected rays do not remain parallel to each other.
2This occurs from smooth surfaces like a mirror, silver spoon, etc.This occurs from rough surfaces like wood, table, door, book, etc.
3The image is formed and seen.It helps to see objects. No images.

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