sound wall to the focal line after fail through a convex condensing & a convex lens causes light to refract and concentrate to magnify distant objects ->  a convex lens will cause the light to refract when the light passes through the convex lens  a convex moisture will effect the sound to refract when the sound carbohydrate through the convex fish & refraction is when light bends -> a convex lens will cause the light to bend when the light passes through the lens