![]() ![]() ![]() If you are doing this at home, you will of course need a hair that you can place into the path of the laser beam. We will exploit this to measure the thickness of a human hair. In the text references for the Background Material is a discussion of Babinet's principle, which essentially states that under the right conditions, a thin barrier to a laser beam results in the same diffraction pattern as a slit of the same width. Use any wavelength and gap width you like to find the distance from the slit to the screen, then confirm your calculation with a new wavelength and gap width.We can adjust the gap width and make measurements of the diffraction pattern, but the distance from the slit to the screen is also important, and that is not given (we are not given a scale for the top of the diagram, so we can't measure it with a ruler). In order to use the simulator to mimic the case of our real-world physical experiment, we will need to make sure every dimension matches. ![]() Measurements of the slit are unnecessary, as the gap width is given in the "Width" slider, but measurements of the diffraction pattern will require a ruler and the scaling provided. Note that the scale lengths for both the slit and the screen are given on their upper-left corners, and they are not the same. The wavelength of the laser and the width of the gap are left as variables for use to play with.
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