TA: Miaoyin (Kevin) Wang
Physics 232—Section 232006
Lab performed Feb. 17, 2009
Lab due Feb. 24, 2009
Lab Seven: Diffraction of Light
Introduction
:
The purpose of this lab is to study the diffraction of light from a multislit transmission
diffraction grating, to learn the relationship and theory for diffraction by a transmission grating,
to use a heliumneon laser to measure and calibrate the line spacing of a diffraction grating, and
to measure the wavelength of lines from a mercury light source.
The type of grating in this lab is a transmission grating which is comprised of many slits
or lines closely and evenly spaced so that the distance between them is approximately equal to
the wavelength.
Diffraction from this type of grating depends on the grating spacing, d, and the
wavelength of that particular light source.
The grating is characterized by the line spacing and
measured by the inverse of the line density, which is given in the equation;
.
As
light passes through the grating, it will be diffracted and the maximum for diffraction is given
using the equation;
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 Spring '08
 MANNELLA
 Diffraction, Light, Wavelength, Diffraction grating, blue line

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