1. Chapter 26: Interference and Diffraction
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2. Goals for Chapter 26 To study interference and coherent sources.
To expand our understanding of interference to two sources of light.
To examine interference in thin films.
To study diffraction from single and multiple slits.
To explore how x-ray diffraction may be used to examine atomic crystals.
To see how the size of a circular aperture changes resolving power.
To see how objects may be imaged by holography.
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3. A Simple Demonstration – Figure 26.2
Toss two pennies side-by-side into a pool. Watch the ripples head outward from each impact until they meet and form the fringes!
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4. Why Should Interference Patterns be Seen? – Figure 26.1
A physical introduction to the concept of two monochromatic waves interfering.
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5. Young's Double-Slit Experiment – Figure 26.3
Young's classic experiment can be duplicated with a laser and two slits made with two parallel scratches on a blackened microscope slide.
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6. The Analysis Can be Shown – Figure 26.4
See figure at right.
Quantitative Analysis 26.1 and Example 26.1 also pertain. See figure below.
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7. An Example from Broadcast Media – Figure 26.7
Example 26.2 is an example from AM radio broadcast.
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8. Surfaces of Thin Films Can Create Interference
Refer to Figures 26.8 and 26.9
This explains why thin films of oil on roads generate "rainbow" scattering.
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9. Thin Film Examples
Refer to Quantitative Analysis 26.2 and Examples 26.3, 26.4, and 26.5.
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10. Newton's Rings – Figures 26.12 and 26.13
Figure at left, diagrams the phenomenon.
Figure at right, shows application for optics QC.
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11. Structural Pigments
Some of the purest and most vibrant colors are made mechanically from gratings rather than from pigments.
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12. Non-Reflective Coatings – Figure 26.14
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13. A Sharp Edge Can Create Fringes by Diffraction
This is illustrated in Figure with a common razor blade.
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14. Fresnel Diffraction – Figure 26.17
A near field phenomenon. The opposite (not illustrated), is a far-field effect known as Fraunhofer diffraction.
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15. Fringes from Single Slit Diffraction – Figure 26.18
An interesting case that shows actual results that differ from the ray model prediction.
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16. Results from a Single Slit – Figures 26.19 and 26.20
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17. Analysis of Fringes from a Single Slit – Figures 26.21 and 26.22
Refer to worked Example 26.6 on page 878.
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18. Experimental Effects on Diffraction – Figure 26.23
The color of the light and the width of the slit will modify the diffraction pattern observed.
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19. Multiple Slit Diffraction – Figures 26.24 and 26.25
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20. A Music CD can Act as a Grating – Figures 26.26 and 26.27
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21. Gratings Replacing Prisms – Figure 26.28
Analysis of light, first done with optical glass or quartz prisms, may also be done with gratings.
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22. Spectra from Gratings – Figure 26.29
Refer to Example 26.7 on page 843 and Example 26.8 on page 844. The figure refers to the latter.
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23. Study of Crystal Structure – Figures 26.30 and 26.31
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24. Size of an Aperture and Resolving Power – Figure 26.35
The diameter of a circular opening determines its resolving power.
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25. The Resolving Power of the Human Eye – Example 26.10
Refer to Example 26.9 in your text.
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26. Holography – Figure 26.37
Objects can be imaged in remarkable clarity by lasers and interference.
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