2” x 2” slides that support a small piece of polarizing film. This film blocks all but the vertical wavelengths of light. When you hold two slides together and rotate one of them 90 degrees, all light is blocked.
| Brand | Unbranded |
2” x 2” slides that support a small piece of polarizing film. This film blocks all but the vertical wavelengths of light. When you hold two slides together and rotate one of them 90 degrees, all light is blocked.