Haidinger fringes
Encyclopedia
Haidinger fringes are interference fringes formed by the interference of monochromatic and coherent light to form visible dark and bright fringes. Fringe localization is the region of space where fringes with reasonably good contrast
are observed.
Haidinger fringes are fringes localized at infinity
. Also known as fringes of equal inclination, these fringes result when light from an extended source falls on a thin film
made of an optically denser
medium. They are also observed in Fabry-Pérot and Michelson interferometer
s. They can be observed by introducing a converging lens between the film and observation plane with focus
of the lens lying in observation plane.
Contrast (vision)
Contrast is the difference in visual properties that makes an object distinguishable from other objects and the background. In visual perception of the real world, contrast is determined by the difference in the color and brightness of the object and other objects within the same field of view...
are observed.
Haidinger fringes are fringes localized at infinity
Infinity
Infinity is a concept in many fields, most predominantly mathematics and physics, that refers to a quantity without bound or end. People have developed various ideas throughout history about the nature of infinity...
. Also known as fringes of equal inclination, these fringes result when light from an extended source falls on a thin film
Thin-film optics
Thin-film optics is the branch of optics that deals with very thin structured layers of different materials. In order to exhibit thin-film optics, the thickness of the layers of material must be on the order of the wavelengths of visible light...
made of an optically denser
Refractive index
In optics the refractive index or index of refraction of a substance or medium is a measure of the speed of light in that medium. It is expressed as a ratio of the speed of light in vacuum relative to that in the considered medium....
medium. They are also observed in Fabry-Pérot and Michelson interferometer
Michelson interferometer
The Michelson interferometer is the most common configuration for optical interferometry and was invented by Albert Abraham Michelson. An interference pattern is produced by splitting a beam of light into two paths, bouncing the beams back and recombining them...
s. They can be observed by introducing a converging lens between the film and observation plane with focus
Focus (optics)
In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge. Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle. This non-ideal focusing may be caused by...
of the lens lying in observation plane.