An Explanation Of The Fringe Width

The Refractive index is usually the measurement of how the rays of light propagate by a component. It is mainly measured by the formula: “n=c/v”. In order to evaluate the effectiveness of the refractive index, it can be stated that if the refractive index of therapy of light is high then the light travelling ability will gradually become slow. This is the main reason the change occurs in the direction of the rays of light within the component. Within the components, the refractive index increases correspondingly lowering the travelling speed of the light. The symbol “μ” or “mu” usually represents the refractive index in Physics. 

The overview of the Width of Fringe

The major reason for the formation of dark Fringes is destructive interference and its position is devoted by calculating the distance between 2 adjacent dark fringes known as “fringe width”. It is also determined as the distance that has been covered between 2 consecutive bright coloured patches, (Maximus) where the “constructive” interference occurs or 2 consecutive dark colour patches (Minimus) where the “destructive” interference occurs. The dark fringe formation is the resultant of the interferences which are destructive in nature. In the resultant amplitude, the interference fringes are denoted as destructive and their intensity is equal to “zero”. 

Refractive index: discussion

The ratio of the velocity of the ray of light present in a vacant space to the light velocity in a component is determined as the “refractive index”. It is also considered to be the property of the material which mainly denotes the materials that affect the light speed passing through it. Through the symbol “n” or sometimes mu or “μ” symbol represent the refractive index. The refractive index of a component is mainly determined as “n = c/v”. Here, “c” denotes the light speed travelling through a vacuum and “v” denotes the light speed passing through a substance. For example, the gradient of the refractive index can be stated as the rate of change of the “refraction index” at a point with respect to the distance of a substance. The light wave frequency remains unchanged, irrespective of the substance and the changes in light wavelength take place on the basis of the refraction index. 

The laws of Refraction

Refraction is referred to the directional change or bending of the wave of light that is travelling from a transparent substance to another. This process takes place due to the change in the speed covered by the light wave. Major laws of refraction can be stated as the incidence angle is the angle that lies between the normal and the ray of the incident and is denoted by the symbol “i”. The refraction angle between the normal and the refracted ray of light is denoted by the symbol “r”. According to the refraction law, it can be explained that the “incident” ray, “normal” ray and the “reflected” ray to the interface of any 2 selected substances lie in the same part. 

Mu or “μ” symbol represents the refractive index

The “mu” or “μ” symbol is mainly used in the case of permeability. The symbol of the refractive index is never defined in the SI unit and is represented by the “mu” symbol. In the refractive index, the “velocity of light wave”, in vacuum, is divided by the “velocity of light wave” in the selected medium. The formula for refractive index is stated as “n=c/v”. In optics, the “mu” symbol is represented as “μ= medium permeability”, “v = light speed in a selected medium.” and “λ = light wavelength in a selected medium”. 

Conclusion

The distance between 2 “consecutive” bright coloured patches where the contrast or the brightness is “maximum”, is then determined as the width of the fringe. There the brightness of the 2 “consecutive dark patches” is equal to “zero”. The fringe width gets affected by the light wavelength and even by the distance between the flat screen or “separation of slits” and the slits. When the ratio of “intensities” becomes equal to 1, the bright fringe intensity reaches its maximum level, whereas the intensity of the dark fringe is equal to 0 and is determined as “minimum”.