Translations:Reflection and refraction – book/11/en

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Thus, AC is equal to DB times . The wavelet at B has a radius of zero. Because the line BC is tangent to all the wavelets, it constitutes their envelope. Therefore, BC represents a refracted wavefront in the lower medium. Line BC is tangent to the circular wavelet MCN at the point C, and therefore it is perpendicular to the radius AC. It follows that AG is a refracted ray associated with the refracted wavefront BC. Now in triangle BAD, we have