Question

What are coherent sources? How are they realized in practice?

Answer 1

Coherent Sources:

1. A coherent source is one that emits a light wave with the same frequency, wavelength, and phase or with a constant phase difference.
2. When the waves superimpose and the maxima and minima positions are fixed, a coherent source produces continuous interference patterns.
3. Coherent sources generate waves with the same frequency and amplitude but with a constant phase difference.
4. Example: LASER light is coherent, parallel, monochromatic, and contains unbroken wave chains.

Methods to make coherent sources:

1. Prisms, lenses, and mirrors with particular parameters are used to create a coherent source.
2. Fresnel's biprism, Young's double-slit experiment, and Lloyd's mirror arrangement are all strategies that aid in the creation of coherent sources.
3. The wavefront is divided into these approaches to form a coherent source.

1. Taking into account the entering beam and splitting its amplitude into distinct portions via partial reflection or refraction assists in the production of coherent sources.
2. These divided beams go in separate directions, colliding with other waves and undergoing interference, where the amplitude is divided to generate a coherent source.