The cumulative amplitude of the light wave can increase or decrease under some conditions. This is known as the interference of light.
Hence, it can be said that due to the superposition of light waves, when the amplitude of the light wave increases or decreases, it is called interference of light.
It is necessary to have lights that are consistent in their output.
Interference can be constructive or destructive.
Interference of light can be shown by using a diagram as follows:
Conditions for the interference of light
The sources of light need to be monochromatic.
The intensities and the contrast between the maximum and minimum amplitudes must be about equal.
When two waves have the same frequency, and a constant phase difference, the source is called the coherent source. For interference, a coherence source is required.
The light source must be extremely tiny to be used as a point source.
The polarization of the lights coming from two different sources needs to be the same.
