4.2.2 Finding the distance of the screen, L. 1. The default setting for this experiment is = 511nm (green laser), a circular aperture with diameter d = 0.1mm zero eccentricity. Do not change the eccentricity of the aperture throughout the experiment. 2. Turn the laser on by clicking the red button on the top left corner. You will see the interference patter for a circular aperture discussed earlier. The length scale for both the circular aperture and the screen are shown one top left sides of the magnified view for the aperture and the interference pattern on the screen. We need the scale for the interference pattern on the screen which is 10mm. Measure the corresponding "scaled length" Iscaled using a ruler from your viewing device. Calculate the scaling factor SF For example in my viewing device and the scaling factor becomes lactual 10mm SF Iscaled Iscaled Iscaled = 280mm SF = 10mm Iscaled = 0.036