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Summary LAB NOTES: WEEK 6 OF PHYSICS 3LC AT UCI
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Typed notes covering Physics Lab (3LC) week 6 lab theory and experiment. Summary of concepts corresponding to the "Diffraction" lab section.

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  • August 13, 2024
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  • 2019/2020
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Wk6: Diffraction Abbreviations:
Saturday, November 7, 2020 1:35 PM b/w = between
w/ = with
INC = increase
• The wave nature of light (diffraction) poses a limit to the resolution that can be DEC = decrease


achieved.

○ Features of an object that are significantly smaller than the wavelength of light Central maxima; labeled n=0.
n=-1
n=-2
cannot be resolved.


○ Electron microscopes circumvent this limit. 100eV= 1.6*10^-17J


• Diffraction: bending of waves around sharp edges.

Dark spots are wavelengths that cancel each other out.
○ Occurs when waves strike objects w/ dimensions comparable to their wavelength.


○ Superposition (sum): sum of all parts of the waves that pass thru the opening.


○ Diffraction pattern: distribution of constructive waves and destructive waves;


depends on the wavelength of the waves and size/shape of the obstacle.


• Diffraction grating: consists of a single slit or many adjacent slits; laser strikes and


allows light waves to come through. Glass w/ holes in line pattern.


• The diffraction pattern produced by a grating is a series of alternating light and dark


spots (Fig. 6.1a).


• On either side of the central spot, at an angle θ1 from the incident direction, are the first


spots, followed by another pair of spots at θ2, etc.


○ The angles are related to the wavelength λ and the spacing between lines in the


grating d by the relation dsin𝜃𝑛=𝑛𝜆. -> dtheta = nλ


○ d: width of a single slit.

• The angle θ between the center of the bright spot and the first minimum (dark spot) is


given by sin𝜃 = 𝜆/𝑑.

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