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Investigating the relationship between the image distance and the object distance for a convex lens

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AS Physics Experiment                

Investigating the relationship between the image distance and the object distance for a convex lens

Fair testing

In this experiment I will be changing two factors which will be the object distance and the image distance.

The following factors that are going to be kept constant are:-

  1. The positioning of the image and light source – if this is changed; it could affect the results and may give anomoulous results. The light source must also point at the image and directly at the convex lens.
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Measure the object distanceMeasure the image distance where the reflection of the image is the smallest and sharp.Measure the bulb filament in the reflection.Record down the measurements.Repeat each time, making sure to decrease the object distance.

 Obtaining Evidence

Results Table

Object Distance (cm)

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Graph – Line of Best Fit



This graph above illustrates that as the object distance is decreased as more light is exposed through the convex lens meaning an increase in image distance. I think the results were fairly accurate, because you can see a general trend and hardly an anomalous result. How because it was conducted by a human rather than machine it would be that it is less accurate than it could have been due to human errors. Because of this I will work out the percentage error for the equipment I used.

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