The Focal Length of The Lens in the Tube
Plan
I plan to set up the apparatus as shown below and change 'b'. To then
make the image focus, I will have to change 'c'. When the image is
focused, I will measure 'c' and also the magnification of the image.
Using this information I will then be able to calculate 'a'.
[IMAGE]
Hypothesis
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I predict that using the equations stated in the justification, after
measuring values for 'c' and 'm'. I will be able to plot them on the
graph of 'c' against 'm'
Using the equation c = fm + [f - a]. I believe that if all the
equations work, a straight line will be obtained.
Safety
======
After considering all aspects of this experiment, I have come to the
conclusion that there are no significant safety issues. If normal
levels of care are exercised, then there should be no risks involved.
Variables that alter
* b and c, (from diagram)
* Magnification
Variables to control
====================
* a (from diagram)
* Ambient light
* Part of object for which magnification is measured each time.
* Place b is measured from and to
Apparatus list
==============
* 0.15m tube
* Lens
* Object
* 12V Power pack
* Light source (lamp) white light average wavelength 550Nm
* White screen
* 2 x 1m rulers (0.0001m increments)
* 0.15m ruler (0.0001m increments)
* Stand and clamp
* Spirit level
Method
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[IMAGE]
-Set up the apparatus as shown in the diagram in black out conditions
(or as close as possible)
-Find the minimum and maximum values for 'b'
-Choose appropriate measurements for 'b' (i.
For this I used the scale provided by the program. The manometer is a U-shaped tube that held liquid. This aided the experiment by showing me how much oxygen was consumed by the rats while they were placed in the jar. The airtight, glass animal chamber was the equipment I used to have an isolated area for the rats to go while I monitored their breathing. The tubes that connected this to the manometer had clamps that allowed me to block the passage way of air into the glass chamber or to stop air flow into the manometer while I collected the results.
Cut a 5 cm length of celery stem 2. Cut through the grooves to divide the stem into thin strips 3. Dry the cell sap from the strips using a paper towel 4. Record and note the mass of each strip 5. Collect 6 test tubes, and put 10 cm³ of solutions 0.0, 0.1, 0.2, 0.3, 0.5, 0.7, 0.8.
B has increased by one fifth of what Test tube A is and Test tube C
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Possible sources of error in this experiment include the inaccuracy of measurements, as correct measurements are vital for the experiment.
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