![]() Here a post (with marks A and B), on the left of the diagram, is on the bank of a completely flat lake, with the observer on the opposite side of the lake at C, looking over the lake towards the post. still water surfaces are horizontal planes which therefore act as horizontal planar mirrors as far as incident light rays are concerned.īasic diagram showing the geometry of reflections on water.a water surface with air above it presents a suitable boundary at which reflection and refraction occur.the angles between a ray of light incident on, and that being reflected from a boundary (between media of different refractive indexes), with that boundary surface are equal.when light reaches the interface between two media of different refractive indexes, some will be reflected from the boundary, and some will be refracted through the boundary.light travels in a straight line when passing through a medium of constant refractive index.The fundamental optical principles underlying all reflections on water surfaces are: They will help clarify discrepancies seen in other paintings, and are also valuable information for any painter who wants to get their reflections correct. Before going any further, it is worth running through them. I was careful to avoid going into too much detail as to the optical principles in such reflections. ![]() In the first and previous article, I pointed out how Turner and Cézanne were unusual in showing discrepancies in the reflections which they painted. ![]()
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