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Lens_Effect of the Laser

Tao Tang

Published Jun 26, 2026• 0 citations
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Abstract

In a modern version of Young's double slit experiment, a laser beam passes through two narrow slits and creates an interference pattern of bright and dark fringes on a distant screen. We place magnifying glasses between the double-slit and the screen, and when a laser beam passes through the double-slit and magnifying glasses, strange patterns will appear on the screen.

DOI
10.33774/coe-2026-vfvdv

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In a modern version of Young's double slit experiment, a laser beam passes through two narrow slits and creates an interference pattern of bright and dark fringes on a distant screen. We place magnifying glasses between the double-slit and the screen, and when a laser beam passes through the double-slit and magnifying glasses, strange patterns will appear on the screen.
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This research was conducted to note the changes in the interference patterns, by different means of reflection. For this, we have used a double slit, different mirrors, and a screen to obtain the image. The hypothesis behind this was that double slit produces a fringe patten on a screen when a coherent light source is passed through it, but what if we put a mirror after the slits and obtain an image on a screen. Not just that, what if we put different kinds of mirrors in between the slit and the screen. We conducted this research in an environment with negligible sources of light except the non-coherent light source, and with negligible vibrations which could affect the image obtained. When this research was conducted with a flat mirror, fringes were roughly the same as predicted by mathematical calculations. But when this research was conducted by a convex mirror, the fringes seemed to be virtual . When this same study was conducted with a concave mirror, the fringes seemed to be either concentrated at a single point, or they seemed to be have enlarged with a virtual image however the ratio of magnified image to the actual image that have been obtained if there was no mirror, remained the same. Whereas in the case of a convex mirror, the image was smaller. This property is useful as it can be used to observe the pattern more precisely by magnifying it and the actual numbers, i.e.- when mirror would not have been used can also be calculated because the magnification is the same.
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.