These are Glass Prism for teaching about light refraction and dispersion.
| Order# | Description | Size |
| 7-909-70 | Equilateral | 25mm x 50mm |
| 7-909-71 | Equilateral | 25mm x 75mm |
| 7-909-72 | Equilateral | 25mm x 100mm |
| 7-909-77 | Equilateral | 25mm x 150mm |
| 7-909-73 | Right Angle | 32mm x 50mm |
| 7-909-79 | Equilateral | 3" x 5/16" |
| 7-909-92 | Equilateral | 42mm x 32mm |
| 7-909-91 | Right Angle | 100mm x 10mm |
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