When an incident ray strikes an interface at an angle less than or equal to the Critical Angle, it is primarily refracted, but reflection also occurs. In optics, reflection is generally present unless the angle is at the Brewster angle with appropriate polarization. The discussion highlights that in the context of mechanical waves, such as those used in oil and gas exploration, reflection is likely to occur regardless of wave type or polarization. The conversation raises the question of whether a Brewster angle exists for mechanical waves in geological contexts. Overall, reflection accompanies refraction in Snell's Law applications across different wave types.
