How Diffraction Lenses Create Repeated Light Patterns

https://eclipseviewing.keystonescope.com/posts/why-proper-solar-filters-matter-when-watching-an-eclipse

How Diffraction Lenses Create Repeated Light Patterns is easier to understand when the viewing goal is clear. 3d fireworks glasses are only one part of the full experience. The setting, fit, storage, and user steps also matter