Introduction:
The purpose of this experiment is to accurately measure the thickness of a human hair by using laser or light interference. First, we taped a human hair on to a 3x5 card with hold, than we pointed a laser through the hole. Finally, we used the image to be projected on to the white board, and measure the distance between the board, and the distance between the middle of the zero overtone and third. We used equation d=λL/y to get the theoretical value in order to compare with the experimental value by using a micrometer.
Experimental Method: (micrometer)
d= 89.2 μm
Theoretical Method:
d=λL/y
=(632.8nm) (0.935m)/(0.075m)
= 77 μm
Conclusion:
By compare the experimental and theoretical value, the percent of error is pretty samll and these values were within the uncertainties range. By we still could find a lot of mistakes that can be made during the processes of the experiment. Such as measuring the distance between the two first order minima due to the lack of precision in equipment.
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