Discussion about Young's interference fringes

Cao Liang-teng

In Thomas Young's interference experiment, a series of light and dark fringes on a viewing screen are observed. Now if the slit is moved small displacement upwards or downwards , or regardless of in the front or back of the slit, which the slit with some kind of medium plate is coved, or the whole instrument is put in some transparent fliud , how is the law of the interference fringes on the screen ? This article will discuss it.

Chun Chiang

Guo Lin

Considering double-slit interference as an optical wave passing a through double-slit hard aperture, the intensity expression of Young's double-slit interference is derived based on Collins diffraction integral. The intensity distribution of Young's double-slit interference is graphically demonstrated. The interference fringes will be changes by adjusting the parameter of slit width, double-slit separation, incident wavelength, etc. Meanwhile, the causes for the different brightness at bright fringe center in Young's double-slit interference are discussed. Additionally, the interference fringe width is calculated. The result agrees well with optical interference theory. As an expanding teach method, it will be helpful to understand the double-slit interference characteristics.

R. A. Houstoun

GU Li-shan

Young's double-slit interference experiment is studied,we analysed how the centyal-ming patterns and media affects interference fringes.The results of the reasons for interference fringes.We found a quick and easy way to deal with the problem.

P. N. Ghosh