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College Physics

The observation and analysis of light intensity distribution of double slit segment coherent interfence

Weiwei Zheng

Published Jan 1, 2003• 0 citations
OpenAlex

Abstract

The light intensity distribution of double slits is observed by using the combination of a light-sensitive photo-electric sensor and a rotary moving sensor. The phenomena caused by segment coherence of the two slit,is interpreted theoretically.

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In this paper, we theoretically investigate a particular experimental setup which coalesces the concepts of the double slit and single slit diffraction. In Thomas Young's classic double slit experiment, monochromatic plane light wave impinges on an opaque screen with two parallel, long and narrow slits and the resulting intensity pattern is observed on a screen placed at a great distance placed from the slits. We show, via theoretical calculations that the if another opaque screen with a single long narrow slit is placed at a distance from the two slits, the resulting intensity pattern on the observation screen is nontrivial and interesting.
tudying from the Huygens-Fresnel's principle,this research first obtains the formula about the light intensity distribution of double-slit interference through the theoretical calculation. Then it simulate the light intensity distribution on the receive screen with the help of Fortran powerstation 4. 0 and Origin 6. 0 Professional software. Lastly,an analysis and discussion is carried out on the impact of the slit width,the distance between the two slits,the light wave length and the distance of receive screen to slit on double-slit interference.