internal - Total ________ reflection, critical - At the ________ angle, light refracts along the boundary, above - If the incident angle is ________ the critical angle, TIR occurs, refraction - the bending of light due to a change in speed, decreases - When light enters a more dense medium its speed, increases - when light enters a less dense medium its speed, incidence - the angle of _______ = the angle of reflection, sin - ______ 90 = 1, snells - The equation for describing refraction is ________ law, refractiveindex - Represented by n, endoscopes - A medical device which uses TIR,

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