![]() Step 3: Recording data to determine the width of tracks in a DVD. Next, draw/mark the diffraction pattern on the paper and measure the distance between the two maxima.While the laser is focused on the CD measure the height at which the laser’s light hits the CD and record it. For a CD the diffraction pattern would appear on the paper, this is why the lab is set up this way.This helps ensure that the laser is hitting the CD at a 90-degree angle. When focusing the laser onto the CD it is very important that the laser is parallel to the table or that while it is focused on the CD its reflection is directly on the source of the laser.Set up the lab according to Figure 2, making sure that the CD and the paper are taped onto the corresponding surfaces.Step 2: Recording data to determine the width of the tracks in the CD. After marking the pattern use a ruler to measure the distance between maxima and record the values as your ∆x value. Focus the laser through the diffraction grating and while it is on, mark and draw the diffraction pattern onto the paper.Measure the distance from the diffraction grating to the textbook, this will be your L value. ![]() Before you begin, record the number of slits in the diffraction grating, this will be your d value.The first thing to do is to set up the lab according to the diagram in Figure 1, make sure the papers are taped onto the textbook and the table.Step 1: Recording data for determining wavelength of the laser.įigure 1: This is the set up for gathering information to determine the wavelength of the Red Laser source -Diffraction grating(s) of known spacingįor this lab, we will undergo three main steps to gather the information we will need to determine the wavelength of the laser and the groove spacing for the CD and DVD The difference in widths of tracks is due to the fact that both the CD and DVD have different storage capabilities therefore the spacings are different. In addition to this, the width of tracks for a CD is approximately 1.6 μm and for the DVD it is 0.74 μm. The wavelength of the laser is within the range of the wavelength of its colour, which is 630nm to 650nm.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |