Question

Is monochromatic light always coherent?

Answer 1

Hint: Two sources are supposed to be coherent when the waves released from them have equal frequency and fixed phase differences. In practice, two methods to generate coherent sources: (i) interference of light occurs between waves from the actual source and a practical source (ii) Interference of light occurs between waves from two sources produced due to a single source.

Complete step-by-step solution:
Coherence is a characteristic of light that allows waves to form temporary or stable interference patterns. Coherence is described as two waves. If two waves are monochromatic and having equal phases, these two waves are defined as coherent waves. Sources producing such waves are known as coherent sources. Such waves can be used to study the characteristics of the optical way. This is done by giving one ray through the desired track and sending the other as a control test.
The term “mono” introduces a singular object or subject. The term “chrome” relates to colours. The term “monochrome” is a reference to a unique color. To know monochromatic, one must first know the electromagnetic spectrum. Electromagnetic waves are divided into several regions according to their energy. X-rays, ultraviolet, infrared, visible, radio waves are to list a few of them. Everything we view is seen due to the visible range of the electromagnetic spectrum. A spectrum is intensity versus the energy plot of the electromagnetic rays. The energy can also be expressed in wavelength or frequency.
Coherent light must have an identical phase as well as an identical frequency. Monochromatic light only has to have the same frequency. A coherent source is forever monochromatic, but a monochromatic source may or sometimes may not be a coherent source.

Note:Two waves are supposed to be coherent sources if they transmit light waves of equal frequency and approximately equal amplitude and are constantly in phase with each other. It is challenging to have two sources that appear as coherent sources. Coherent sources have characteristics: The waves produced have a fixed phase difference, and the waves are of an individual frequency.