Bright Spot Lab

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This experiment successfully produced Fresnel’s bright spot using the procedure discussed earlier. Under these conditions a few things that could have done better and things that were odd compared to similar experiments were observed. A second experiment was attempted to test some of the observed results but was not successful.
Variables tested
To test the way Arago’s spot reacts to different factors variables were changed. The distances between objects was varied, and the size of the balls was changed. the result of changing distances was minute at best as observed by eye, as the laser got closer to the screen the light got brighter but by a hardly noticeable amount. As the size of the balls was increased a noticeable difference could be seen. When a large ball …show more content…
The room used for the experiment was fitted with black out curtains but have been installed about 10cm from the window allowing some sunlight to pass through into the room. Further darkening the room would have led to more accurate results since weaker obscured light would be made more obvious.
Another improvement to be made is the way the experiment itself was conducted. In this experiment changes in distance were made but not logged in any way until the end. Throughout the experiment the distance of the balls to the lens was changed the balls to the screen and the laser to the lens. Although no noticeable difference was noticed some difference had to be noticed but results collected photographically cannot be tested due to the way the experiment was conducted.
To further develop this experiment a lux metre should have been used to observe the intensity of the bright spot on the attempt to find a correlation in distance of the laser and other things. The use of a lux metre would have dramatically improved this experiment but unfortunately the required foresight was not used to implement

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