The term critical angle describes
∙ A. the point at which light is refracted
∙ B. the point at which light becomes invisible
∙ C. the point at which light has gone from the refractive mode to the reflective mode ∙ D. the point at which light has crossed the boundary layers from one index to another
∙ A. the point at which light is refracted
∙ B. the point at which light becomes invisible
∙ C. the point at which light has gone from the refractive mode to the reflective mode ∙ D. the point at which light has crossed the boundary layers from one index to another