  We study the bending of gravitons that pass near a massive object like the
Sun, using scattering amplitudes in which the Sun is represented by a massive
scalar particle. Our results complete previous work on the bending angles of
massless spin-0, spin-$\frac{1}{2}$ and spin-1 particles, and provides more
evidence for the violation of the equivalence principle at the quantum level,
in the sense that the quantum corrections to bending angles for massless
particles with different spins are different. We provide a universal expression
for the bending angle in terms of coefficients of triangle and bubble integrals
in the amplitudes in the low energy limit. We also compare bending angles for
scalar, photon and graviton projectiles under different circumstances.
