lab4-wavelength of light - PHY 1033C Lab#4 Measurement of...

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PHY 1033C Lab #4 September 21, 2010 Measurement of Wavelengths of Light Goal: Measure the wavelength of light with a diffraction grating. Introduction: A transmission diffraction grating consists of a thin piece of clear plastic which contains many closely-spaced scratched parallel lines, from which light scatters as if from many parallel slits. When a beam of light is incident on a diffraction grating, part of the light passes straight through the grating (in the direction of the incident light) and part of the light is diffracted by the grating into different propagation directions. The scratches are very narrow (less than a wavelength) and each re-radiates the light incident on it in all directions; the fraction of the incident light propagating in a given direction is the sum of the light emitted in that direction by the many line slits, like a sum of a number of 2-slit interference patterns. Just like the 2-slit case, the rays emitted by the individual slits at the angle θ (see Fig. 1) will all be focused by the lens at its focal point F.
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