Difference between interference and diffraction in tabular form

Difference between interference and diffractionThe interference is the combination of the superposition of two or more waves that are in a point of space. The diffraction is the deviation suffering waves around the edges and corners that occurs when a portion of a wavefront is interrupted or cut it by a barrier or obstacle. Fringes width in interference of light is equal while in the diffraction of light fringes width is not equal.

What is Interference of light?

The modification in the distribution of light energy due to the superposition of two or more waves is called interference of light.

Conditions for interference

  • Light source should be monochromatic.
  • The light source should be coherent mean they should not be independent but should be a subsidiary source and derived from a single source.
  • The light source should be narrow and have the same intensity.
  • For constructive interference path difference between light, rays should be an odd integral multiple of the wavelength of light.

path difference =0,λ ,2λ, 3λ,———–mλ
Where m=0,1,2,3,………

  • For destructive interference, the path difference between the light rays should be an odd integral multiple of half the wavelength of light.

Path difference = λ/2 ,3λ/2 ,5λ/2 ,7λ/2 ,…………… (m+ 1 λ/2)
Where m= 0,1,2,3,…..

Diffraction of light

The bending of light around an obstacle is called diffraction of light. The bending of light the diffraction effect depends upon the size of the obstacle. Diffraction effects are large if the edges of the obstacle are sharp and aperture is comparable in size of the wavelength of light of the order of 10 ¯7 m.
Diffraction of light is of two types:

  • Fresnel Diffraction
  • Fraunhofer diffraction

Difference between interference and Diffraction

   Interference                  Diffraction
1: Interference is due to the interaction of light coming from two different wavefronts originating from the same source. 1:Diffraction is due to the interaction of light coming from different parts of the same wavefront.
2:Interference fringes are of the same width. 2:Diffraction fringes are not of the same width.
   3:  All bright fringes are of the same intensity. 3:All bright fringes are not of the same intensity.
4:All point of minimum intensity are perfectly dark. 4:All point of minimum intensity is not perfectly dark.
5:The spacing between fringes is uniform.                                                                                                    5:The spacing between fringes is not uniform.

Related topics:

Related Differences Topics:

Polar Vs non-Polar dielectrics Reversible  Vs Irreversible Process
Galvanometer Vs Ammeter Conservative Vs Non-conservative forces
Series circuit Vs Parallel circuit Fuse Vs Circuit breaker
Acceleration Vs Velocity Speed Vs Acceleration
Young’s modulus Vs Bulk modulus Young’s modulus Vs Shear modulus

Related Articles


  1. Hey Your method of describing all in this article is in fact good, all can easily be aware of it, thank you

  2. Wow! This could be one particular of the most beneficial blogs We have ever arrive
    across on this subject. Basically Wonderful. I am also an expert in this topic
    therefore I can understand your effort.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Back to top button

Adblock Detected

Please consider supporting us by disabling your ad blocker