Diffraction grating Lab report

November 24, 2013
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Unformatted text preview: Experim Diffraction Grating Difraction Grating Peter Jeschofnig, Ph.D. Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor. Obser vations Data Table 1: Data from recorded observations. L (m) of laser (nm) Δ x (m) (tan-1 ( Δ x avg /L) Data Table 2: Data from recorded observations. of laser (nm) L (m) = d (cos θ i – cos θn) Questions Part I: A. Convert the wavelength of the laser pointer from nm to m. Note: 1 nm = 1 × 10–9 m. B. Calculate the average value for Δ x from the various individual measurements. C. Calculate the angle θ from tan = Δx L D. Find sin . E. Solve for d using n=d sin . For example: d= n sin F. Use d to find d 1 . In other words, how many lines are there per millimeter of difraction grating? Part II: A. Calculate θi: tan-1 (distance between h0 and baseline) (distance from laser point on CD to wall) B. Calculate θn : (distance between h1 and baseline) tan 1 (distance from laser point on CD to wall) C. Calculate d: cos i – cos n D. Calculate number of grooves per mm: 1 d E. Calculate number of grooves on CD: (Grooves/mm) x (Radius for grooved portion of CD only) ...

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