Transcript
Physics II Laboratory Faculty of Science, UOIT
Report for Experiment PhyII-05: Diffraction and Interference
Student name: CRN: Date: 09/03/2020_______
Single slit:
a = 0.04 mm (given)
= 650nm__________
Distance between the first minima on each side of the central maximum divided by 2: 1.65______
Distance between the slit wheel and the mask on the front of the light sensor: 88.5cm__________
d = 1.068____________
a = 6.08*10^-6____________ (calculated)
Percent difference == 0.52%______________
Double Slit
a = 0.04 mm (given), d = 0.125 mm (given)
= 650 nm___________
Distance between the central maximum and the first side maxima in the interference pattern 0.235cm__________ (average of the two values on both sides of the central maximum)
Distance between the slit wheel and the mask on the front of the light sensor: 88.5cm__________
i = 0.152____________
d = 4.9*10^-6____________ (calculated)
Percent Difference == 0.99%______________
Distance between the first minima on each side of the central maximum in the diffraction pattern divided by 2: 0.37cm _________
d = 0.24____________
a = 3.1*10^-6____________ (calculated)
Percent difference == 0.99%______________
Number of interference maxima in the central envelope __2_______
Width of the central maximum in the interference pattern ___0.23cm______
Four Slits
a = 0.04 mm (given), d = 0.125 mm (given)
= 650nm___________
Distance between the central maximum and the first side maxima in the interference pattern 0.035cm__________ (average of the two values on both sides of the central maximum)
Distance between the slit wheel and the mask on the front of the light sensor __88.5cm________
i = 0.023____________
d = 3.23*10^-3____________ (calculated)
Percent Difference == 9.26%______________
Number of interference maxima in the central envelope ___2______
Width of the central maximum in the interference pattern ____0.46_____
Conclusion
The purpose of this experiment was to compare the similarities and differences between the interference and diffraction patterns. In addition, the experiment was also used to compare the calculated slit separation against the given slit separation We performed the experiment using the rotary motion sensor, the laser, the slit disks, and the linear translator. The patterns were then recorded using capstone, and the results were further analyzed.
In the first experiment a single slit was used, and we were able to observe an interference pattern with wide a central maxima and dark fringes that were close together.
In the second experiment a double slit was used, and we were able to observe a pattern that was almost the same, except unlike the single slit pattern, the central maxima were much narrower but more intense in light intensity compared to the single slit.
In the third experiment a quad slit was used, and it produced the same pattern as the second, except for the fact that the central maxima were narrower than the double slit. However, it was even brighter than the double slit and the dark fringes were wider than the dark fringes in the double slit. Through these results were able to observe that there is a relationship between light intensity, the number of slits, and the width of the central maxima. The more slits there are the brighter and narrower the central maxima gets.
Report for Experiment PhyII – 05: Diffraction and Interference Page 1 of 2
