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About BrainOnLost

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  1. Hello there, I found when light ray pass a transparent material on wet and dry surface, there is some phenomenon happened. This is what seem on a dry surface. The observation could seem the light was spread evenly on the surface. This is what seem on a wet surface. Something weird happened, the light was spread like a ring with a hollow on the center. I guess this phenomenon was related to Frustrated Total Internal Reflection, but could somebody can explain briefly on this?