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Mar 8, 2022 at 9:27 vote accept AlgebraicsAnonymous
Mar 8, 2022 at 9:26 comment added AlgebraicsAnonymous I will accept this answer, because together with Mr. Ruslan's comment, it serves as an acceptable dispersion of my inquisitiveness.
Mar 8, 2022 at 9:25 comment added AlgebraicsAnonymous The wave front may, however, be very curved, even if it's projection to the plane perpendicular to the upward vector of the medium boundary is a line. Thus, it would be difficult to speak of the preservation of a property when referring only to the surface.
Mar 7, 2022 at 18:37 history answered Sebastian Riese CC BY-SA 4.0