Question

What do you mean by coherence? How are coherent sources produced in a laboratory?

Answer 1

1. The features of the relationship between physical quantities of a single wave or between numerous waves are described by coherence.
2. When two waves have a zero or constant phase difference and the same frequency, they are said to be coherent.
3. Coherence can be divided into two categories:
   4.1 Temporal
   4.2 Spatial.
4. The following two procedures are used in the laboratory to create coherent sources -
   6.1 A mirror, lens, or prism divides the wavefront into sections.
   6.2 Refraction and partial reflection divide the amplitude of the beam.
5. These separated sections function as synchronized lights and travel in separate directions. They later rejoin to create interference.
6. In the laboratory, there are two methods for coherent sources:
   8.1 Division of wavefront, in which the wavefront is separated into two or more sections using mirrors, lenses, and prisms.
   8.2 Young's double-slit arrangement, Fresnel's biprism approach, Lloyd's mirror method, and others are common methods.
   8.3 Amplitude division occurs when the entering beam's amplitude is divided into two or more pieces by partial reflection or refraction.
   8.4 These fragmented components take diverse courses before reuniting to cause interference. For example, Newton's rings, Michelson's interferometer, and so on.