Title
Hypothesis
- Relationship between u, v and f a lens.
- 13 April 2010
- The image distance, v of a lens with constant focal length, f is affected by it object distance, n.
Hypothesis
- When the object distance for lens become shorter, the image distance become longer
- The shorter the object distance for lans, the longer its image distance.
- To investigate the relationship between object distance and image distance for a lens with fix focal length.
- Manipulated variable: Object distance, n
- Responding variable: Image distance, v
- Fix/Constant variable: Focal length, f
- Cardboard with a cross wire in a triangular cut-out, light bulb, lens holder, convex lens, metre rule, and white screen.
- Setup the materials and apparatus as shown in the Figure 1 (No upload)
- Adjust the object distance, u, until it is equal to 40.0cm.
- Adjust the white screen until a sharp image form on the screen and measure the image distance, v by using meter ruler.
- Repeat the step 2 and step 3 for u, 35.0cm, 30.0cm, 25.0cm, 20.0cm and 15.0cm.
- Record the experiment result in a suitable tabulate from.
- The gradient of the graph, m is...
- From the graph, when u=100.0cm v=...
- From the graph plotted, it is found that the 1/v decreases as 1/u increases.
- The experiment result in the table show that when v decreases, therefore the experiment hypothesis is accepted.
- The hypothesis is accepted.
- From the table is proof that the relationship of object distance, u, image distance, v and focal length, f can be summary in a formula as shown below.
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