Translations:Snell’s law/2/en

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The particle is like a little air-plane. The fuselage goes along the raypath. The airplane is steered by the wings, which extend at right angles to each side. The left wing enters the high-velocity layer first, whereas the right wing is still in the low-velocity layer. This swings the plane to the right, and the raypath bends at the interface. How much does it bend?