# Lab #24 - the other • The higher the diffraction grating...

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Prof Adams Joel Kellogg Physics II Lab Section B July 29, 2009 Lab #24 Interference of Light Waves Partners:

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Joel Kellogg Goals: The main goal of this lab was to observe the interference of light through different diffraction gratings. Procedure: The procedure can be found in the Summer 2009 COOP Physics II Lab manual on pages 69 – 75
Data:

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Analysis: The uncertainty for the instrument, the ruler which the light was reflected on, was given as 0.2 cm. the uncertainty for tan was calculated using the high low method. The uncertainty for sin is the same as the corresponding value for tan. The uncertainty for wavelength was calculated using the high low method. Sample Calcualtions: High low Method: Wavelength: Percent difference: Average: Sin θ : Tan θ : θ :
Results and tables:

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Summary of Results: Through the data it shows that the higher the order number the more accurate the calculation of wavelength was. Overall using the different diffraction gratings, the values for wavelength were all close to each other, so no grating gave a more accurate value than
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Unformatted text preview: the other. • The higher the diffraction grating the bigger the angle of infraction was. Conclusion: The third order slit images were the closest to the observed value. And the first were the furthest from the observed value, as to say that the third order had the lowest percent difference and the first had the highest percent difference. When using the 100, 300, and 600 gratings it was noticed that the slit images were positioned differently on the ruler. This had to be accounted for by moving the grating closer to the ruler as the lines/mm got larger. The slit images seemed to become further apart as the gratings got larger, this is to say that the θ became larger. No grating gave a more accurate answer than the other, however the slit images did give more accurate results. The lower the slit image (the closer it was to the center image) the more accurate the calculation for the wavelength was....
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Lab #24 - the other • The higher the diffraction grating...

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