Phys 104 - BlackBoard Notes: Diffraction and Interference

Diffraction & Interference
BlackBoard Notes

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

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

Three experiments (in any order !):

1.   Observe diffraction, interference patterns (single- and double-slit)
2.   Measure λ of red and green lasers
3.   Measure extreme violet and red λ's of visible light

Room Setup Map:

$Diffraction room map$

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

(1) Diffraction, interference – a qualitative analysis:

.

Single Slit Single Slit:
How does a wider slit width
affect the diffraction pattern?

Double Slit Double Slit:
How does a greater separation between slits
affect the interferece pattern?

Reset the slit discs when finished!

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

(2) Wavelength of red and green lasers:

mλ = d sinθ
d = 0.0125 cm

x/d

m lambda

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

(3) Limits of vision:

Note: Can't use small angle approximation!!

Return to Setup

	Single Slit: How does a wider slit width affect the diffraction pattern?

	Double Slit: How does a greater separation between slits affect the interferece pattern?


©	St. Lawrence University	Department of Physics