6C Diffraction

Arago's (Poisson's) spot

Laser and Lens.
Catalog: 
6C20.10A
Location: 
Ga3
Shine a diffused laser beam at a small sphere or disk. The projected image shows Argo's spot.

Multiple Slit and laser

There are several patterns to choose from. ASU copyright
Catalog: 
6C10.15C
Location: 
Ga2
PASCO 8523 multiple slit set has many variations of multiple slit themes on a disk. The disk is rotated before a laser to show:
4 double slits
1 variable slit
4 comparisons of single/double slits of same width
double/double slits
double triple slits
set of 4 multiple slits (2,3,4,5 slits)

Single Slit and Laser

ASU copyright
Catalog: 
6C10.10
Location: 
Ga2
Shine a laser beam through slits of various sizes.