Lab Report N.pdf - Physics 103A Lab N Grating Diffraction 1 Introduction For this lab we correlated the known wavelengths from a Mercury vapor lamp to

Lab Report N.pdf - Physics 103A Lab N Grating Diffraction 1...

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Physics 103A Lab N: Grating Diffraction
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1. Introduction: For this lab, we correlated the known wavelengths from a Mercury vapor lamp to understand diffraction grating and used it to determine the groove spacing and the groove density and compared it to the nominal value. From the Helium vapor lamp, we determined the wavelengths using the calibrated grating. A diffraction grating is a dispersive portion in many optical instruments and consists of many equally spaced rulings. A typical grating has hundreds to thousands of lines per millimeter. Gratings could either be reflective or transparent. The groove density, l, is equal to the reciprocal of d, groove spacing. When the light of a given wavelength is incident to the plane of grating, each slit becomes the source of a secondary wavelets of the same wavelength as the incident light. When the secondary wavelengths interfere, they produce a pattern of narrow bands, spectral lines on a screen distant D. To find the angle of the grating, , where m is the order number of the diffraction spectrum and d is the in θ λ/ d s = m distance between the slits. When light of numerous wavelengths is incident on the
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  • Summer '20
  • Light, λ, 0005785 m

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