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PURPOSE: To become familiar with the spectrometer and its use with a diffraction grating, to measure the wavelengths of light given off from the hydrogen atom Diffraction Grating. Page 2. This is the main instrument of the experiment, the prism/grating spectrometer. telescope and the grating table, are.Diffraction grating 173 arrangement is provided to enable measurement of the angle through which the telescope arm or the prism table is rotated. Experiment. 6.2 Experiment: 1. Place the vertical cross-hair directly on top the slit and record the angle of zero diffraction θ0. A diffraction grating is composed of a large number of narrow evenly spaced slits. Figure 9.1: Schematic arrangement of diffraction experiment. When white light goes through a diffraction grating (diffraction glasses), different colors are Repeat the experiment with several laser pointers. A monochromatic light beam that is incident on a grating gives rise to a transmitted beam and various diffracted beams , at angles that depend on the ratio In this lab, you will use a spectrometer to study diffraction from a grating and measure the wavelengths of certain lines in the spectrum of different lamps Diffraction through grating. Experiment (Aim, Apparatus required, Formula used). Least count of spectrometer. Procedure to perform experiment.