snell law |
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| navigate by keyword : surface air physics derivation snell law formula velocity boundary educational reflection optical incidence refractive index nature normal medium line template icon sign refraction speed light angle graphic refracted ray element chemistry phase velocities set sines angles indices water chemical science reflected substance object black beam symbol education arrow concept isolated students incident chart math background measure diagram graph draw equation art wavelength direction vector definition drawing design flat school optics |
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| angles of incidence and refraction |
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