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This means that all light rays with an angle of incidence in the water that is greater than 48. 8° will be a) totally absorbed by the water. A negative magnification for a mirror means that a) the image is inverted, and the mirror could be either concave or convex. B) the image is upright, and the mirror is convex. The mirror formula is applicable both in plane mirrors and spherical mirrors (convex and concave mirrors).