Geometrical optics
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Describing light propagation in terms of rays.
Ray - idealized geometrical model of light.
Law of refraction possible to use for reflective surfaces, curved surfaces can be modeled by ray tracing.
Shell's law can show deflection of a light ray while refraction.
Lenses - devices which produces converging or diverging light rays during refraction. In general two types: convex and concave lenses.
Focal point can be modeled by lensmaker's equation, prediction of how images can be produced by lens formula.