Purpose
The purpose of this experiment was to measure the human's hair. We using Young's double slits experiment.
Experiment
Setting up the equipment:
A laser which produces light rays of around 650 nm wavelength was used in this experiment, and the interference image was projected on a white board.
The length of a slit on the edge was recorded.
Measure the thickness of a hair with a micrometer
Conclusion
This experiment was successfully finished. The result has an error of 22.6% which is good.We learned how to use Young's double slits to measure a object thickness.
Setting up the equipment:
 |
A laser which produces light rays of around 650 nm wavelength was used in this experiment, and the interference image was projected on a white board.
The length of a slit on the edge was recorded.
Measure the thickness of a hair with a micrometer
Data and Analysis
Wavelength,λ (nm)
|
633
|
Distance,L (cm)
|
150 ± 1
|
Distance between 2 fringes,y (mm)
|
11.906 ± 0.01
|
Experimental diameter of the hair (μm)
|
79.7 ± 0.65
|
Actual Diameter of the hair (μm)
|
65 ± 10
|
% error (%)
|
22.6
|
Conclusion
This experiment was successfully finished. The result has an error of 22.6% which is good.We learned how to use Young's double slits to measure a object thickness.
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