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Determine the effect changing the object to the lens distance has on the distance at which the image is displayed.

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To determine the effect changing the object to the lens distance has on the distance at which the image is displayed


To make my predictions I decided to use a quantitive prediction method, the equation for this is:

          1                =                1                    +                     1

focal length (cm)                   Object-lens distance               Lens-image distance

To use this method I will have to know the focal length of the lens. To do this we did a preliminary experiment where I put a lens opposite a window with a piece of paper behind. I moved the paper back and forth until the image of the outside became clear on the paper. The distance from the lens to the card, when the image is in focus gives the focal length.

Having established the focal range of the lens was 10.

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Equipment List

  • Ruler
  • Screen of thick white paper
  • Photographic slide (as object)
  • Lens (focal length of 10cm)
  • Lens stand
  • Clamp stand
  • Power pack
  • Ray box

Experiment Diagram


  1. Set up equipment and find focal length of lens.
  2. Measure out object/lens distance with a ruler.
  3. Three tests and measure lens/image distance.
  4. Do the same for 11,12,13,14,15 object lens distance three times each and measure lens/image distance.
  5. Pack away.


I will set up my equipment as I have shown above in the diagram and then change the distance between the screen and the lens until the image projected on the screen is as clear as possible.

I will record the v value for each of the different u values. I will then repeat experiment three times in order to ensure accuracy.

Fair Testing
In order to ensure that my results are as accurate as possible, I will take care not to alter any of the control variables.

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Despite this the chance for inaccuracies, the investigation turned up no anomalies and the quality of the evidence is good. But the experiment could be repeated with better equipment (mentioned above) and a wider range of lengths. I could also repeat the experiment varying the angle of the lens, and the focal length of the lens to see if they have an effect on the images produced and if so, what the effects are.

Chris Horridge 11S

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