👉 Spirantism is a term used in physics and astronomy to describe the phenomenon of light passing through an object with a finite thickness, such as a thin film or a slab. It describes how light behaves when it passes through a material that has a finite thickness, such as a thin film or a slab. In simpler terms, spirantism is like how a small piece of paper can bend under pressure to create a larger fold in the middle. The thin object (the film or slab)
