: : Well only black holes and triangular prisms can bend light.

Prisms or lenses, whether triangular, square, hexagonal, concave or convex, all REFRACT light, which is different from bending; the air-to-glass surface alters the direction of light angularly according to the index of refraction and the angle of incidence. Even a watery surface will refract light; but it is not the same as bending. The gravitational fields of black holes bend light (as seen by an outside observer) but they are not the only objects that can "lens" light in this way; any object with mass and, therefore, a gravitational field, will bedn light the same way, according to the degree of warp that spacetime takes on as a result of the strength of the field. Stars, galaxies, planets, people and thimbles all bend light, although it is only an importnat phenomenon for the first two of these objects...Bruce