Physics Lab-11 Virtual Lab Source : http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/slits.html Assessment Criterion – DCP Research Question: How does the slit width vary the angle that is required for a maxima in double slit diffraction? Hypothesis: There will be an inverse relation between slit width and angle. Independent variable: The slit width is the independent variable. Dependent variable: The angle for maxima is the dependent variable. Controlled Variables: 1. The wavelength is controlled at 500 nm. 2. The distance between the slits and the screen at 100 cm. Results: The raw data table is shown below. a / μm θ / rad 1 0.536 2 0.253 3 0.167 4 0.125 5 0.100 6 0.083 7 0.071 8 0.063 This was plotted on a scatter graph. Data Processing: To linearize the data 1/a was plotted against ϴ. The processed data table is shown below. (1/a) / θ / rad (1/μm) 1 0.536 0.5 0.253 0.333333333 0.167 0.25 0.125 0.2 0.100 0.166666667 0.083 0.142857143 0.071 0.125 0.063 The scatter graph is shown below Conclusion and Evaluation: 1 The hypothesis was correct as 𝑎 had a linear relation with 𝜃. The errors were not considered since it was a virtual experiment.