Did the same thing to a science teacher when they said, “light only travels in a straight line” thing. It DOES only travel in straight lines, but refraction is a thing, and geodesics are never perfectly straight.
When talking about normal refractions, it can be argued that thoose are still two peices of straight lines just like reflections.
But there was some experiment which light bends in curved path in a solution of varying concentration from top to bottom. So there was a gradient of optical density(higher at bottom) and caused smooth curving of light
Did the same thing to a science teacher when they said, “light only travels in a straight line” thing. It DOES only travel in straight lines, but refraction is a thing, and geodesics are never perfectly straight.
Bonus, it only travels through a straight line through curved space, so to an outside observer the light did curve.
When talking about normal refractions, it can be argued that thoose are still two peices of straight lines just like reflections.
But there was some experiment which light bends in curved path in a solution of varying concentration from top to bottom. So there was a gradient of optical density(higher at bottom) and caused smooth curving of light
Edit: Oh it was just sugar solution http://physicsed.buffalostate.edu/pubs/StudentIndepStudy/EURP09/Sugar/sugar.html
Edit 2: Found this too which is much better demo https://m.youtube.com/watch?v=rnNjV3fh-4M