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I followed the suggestion and turned on Light Tracing, and indeed, a spot appears on the screen that corresponds to a beam deviating according to Snell's law. But that is not all. Three more spots appear; one spot has its nature in a light beam that is unaffected by the glass slab. The other two spo...

I have created a scene based on the image below. A spotlight illuminates a glass slab with a refractive index of n and strikes a translucent screen. Below the screen, an orthographic camera is positioned to capture images for different values of the refractive index. One would expect the position of...