Diffraction & Interference - 152
BlackBoard Notes

======================= Photo - Click for a Larger Version =============================

Need new photo in 2027. Switch 'x' to 'y' for opposite sides in figures!

======================= First Board Section =============================

• Three experiments (in any order!):

1.   Observe diffraction, interference patterns (single- and double-slit)
2.   Measure λ of a red laser **A Lab Practical Skill**
3.   Measure extreme violet and red λ's of visible light

======================= Second Board Section =============================

• (1) Diffraction, interference – a qualitative analysis:

	Single Slit: How does a wider slit width affect the diffraction pattern?
	Double Slit: How does a greater separation between slits affect the interference pattern?

======================= Third Board Section =============================

• (2) Wavelength of a red laser: **A Lab Practical Skill**
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nλ = d sinθ d = 0.0125 cm So: Solve for xm: Plot y vs. n!

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======================= Fourth Board Section =============================

• (3) Limits of vision: (Note: should be nλ…, "What is n here?", and change vertical axes from x to y)

• Note: Can't use small angle approximation!!

©	St. Lawrence University	Department of Physics

Revised: 21 Jul 26

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