YP Refraction is a tool to learn all about the
refraction of light (Snell's law) in geometrical
optics. The program provides a laser source that
can be moved around a prism. Six different prisms
are available: a simple frontier between two media
of different index of refraction, a semicircular prism,
square prism, a rectangular prism, two triangular
prisms (60°-60°-60° and 90°-45°-45°). The user
can change the indices of refraction. The normal
at each point of incidence, the angle of incidence,
the angle of refraction, the indices of refraction and
the direction of propagation are displayed. The
obtained diagram may be printed, copied to the
clipboard, or saved as a PICT file.

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