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The bending of light as it passes through a medium of one optical density into a medium of another optical density.

Refraction causes the trout not to be where you think it is.

Refraction also contributes to Snell’s circle, the trout’s window.

… a phenomenon by which an underwater viewer sees everything above the surface through a cone of light, The area outside Snell's window will either be completely dark or show a reflection of underwater objects…[glare]

The window diameter is double the trout’s depth The higher the fish is in the water column the closer you can get, but the more accurate your cast must be.

To be continued


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