Class 12 Physics Wave Optics Interference and Diffraction

Interference and Diffraction



It is the superposition of two waves originating from the narrow slits.

It is the superposition of a continuous family of waves originating from each point on a single slit.

Pattern has a number of equally spaced bright and dark bands.

The central bright maximum is twice as wide as the other maxima.

There are 2 point sources. They cannot be split into smaller sources.

There is only one source. This source can be split into ‘n’ number of sources.



Interference & Diffraction: Conservation of energy

  • Interference and diffraction phenomenon both obey the principle of conservation of energy.
  • Light energy is neither lost nor gained. Light energy is redistributed.
  • Total energy is conserved.

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