Experiment 72 - Luke Wyatt Experiment 34 8/11/06 Experiment...

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Unformatted text preview: Luke Wyatt Experiment 34 8/11/06 Experiment 72: Measurement of focal length of diverging lens using a converging lens Risk Assessment The Experiment had a very low risk. These are outlined below. 1. Electrical – due to the use of mains electricity 2. Thermal – due to the heat conducted by the light box Experiment Aim The aim of the experiment was to measure the focal length of a converging lens and then to measure where the image focused when a diverging lens was introduced to the system. These results can then be used to find to focal length of the system. Apparatus & Diagram Below is a list of all the apparatus which was used in the experiment Illuminated object Converging lens Diverging lens Screen Meter rule Below is a diagram of how the apparatus was set up in order to collect the results. 1of 10 Luke Wyatt Experiment 34 8/11/06 Theory For the diverging lens, with the ‘Real is Positive’ convention v x v f 1 ) ' ( 1 1 +-- = virtual object, real image Results ' 1 1 v I L = (m) x L L = 2 1 (m) v L L = 2 1 (m) x v u- = ' (m) f (m) u 1 (m) v 1 (m) 4 x10 36 x 3 x10 31 4 x10 9 . 28 2of 10 Luke Wyatt Experiment 34 8/11/06 Starting at 103Ω →75 μ A Current ( μ A) Average Time (seconds) 70 60 5.78 ± 0.2 50 10.42 ± 0.2 40 21.99 ± 0.2 30 33.38 ± 0.2 Voltage 6V 3of 10 Luke Wyatt Experiment 34 8/11/06 4of 10 Luke Wyatt Experiment 34 8/11/06 Calculation From the graph it is shown that the time taken for the current to fall is as follows In experiment 1 From 90 μ A to 45 μ A = 20secs From 80 μ A to 40 μ A = 23.75 - 3.5 = 20.25sec In experiment 2 From 70 μ A to 35 μ A = 25.5sec From 60 μ A to 30 μ A= 33.4 – 5.75 = 27.65sec Errors...
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Experiment 72 - Luke Wyatt Experiment 34 8/11/06 Experiment...

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