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# Investigating the factors which Affect the image formed by a Convex lens

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Introduction

INVESTIGATING THE FACTORS WHICH AFFECT THE IMAGE FORMED BY A CONVEX LENS APPARATUS Light box, screen, slide, stand, lens, power pack and metre rulers. METHOD 1. I set up the apparatus as shown in my prediction. 2. I then turned the light on putting it on 10v. 3. I then, by using a ruler, placed the lens 70cm away from the object. 4. I then moved the screen closer and further away from the lens in order to get a clear picture projected onto the screen. 5. When I had a clear picture, I measured the length between the lens and the screen. I recorded the result. 6. I will then move the lens 5cm closer to the light box and repeat steps 4 and 5. ...read more.

Middle

The image was inverted for al distances. For example, the image created with the lens 32cm away from the light box is clear when the screen is 110cm away from the lens. The image created with the lens 61cm away from the light box is made clear with the screen 42cm away form the lens. On my graph, as well as my actual results, I plotted the theoretical results using the formula: 1 + 1 = 1 U V F I had estimated the focus length of the lens I used was 20cm by projecting the light shone though a window through the lens and onto the screen. I then measured the distance between the screen and the lens. ...read more.

Conclusion

This shows that my evidence was reliable; as does the fact that I obtained no anomalous results. However, the procedure was not entirely accurate. It was very hard to get the light box lens and screen to line up perfectly and I do not know if this affected my results in any way. To improve the experiment, I would like to have done the measuring with more accuracy. In this experiment I only took measurements using centimetres to no decimal places. If I did it again I would take the measurements using millimetres. If I did the experiment again I would not only investigate one factor. I would also investigate the size of the image projected onto the screen when a clear picture has been obtained. I would also use more that one lens to see if a change in focus point would make that much of a change to the results. ...read more.

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