Translations:Two orthogonal sets of circles/21/en

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The slope of the radius of the wavefront must be the same as the slope of the ray. The center of the wavefront circle must lie on the y-axis, because otherwise, wavefronts would intersect. The radius of the wavefront circle has the direction at point on the ray. The radius r of the wavefront circle is equal to the distance in this direction from the given point H on the ray to the y-axis.