If photons have no mass, why are they affected by gravity? (Strange Universe series)

If photons have no mass, why are they affected by gravity? (Strange Universe series)
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answer:Perhaps the conditional is dependent upon having an anti particle, of which the photon has none, allowing it to be simultaneously both wave and particle. But that hypothesis would be rejected if the neutrino theory is ever confirmed. When considering the lensing effect, one must acknowledge that the photon in is two different places at the same moment. Not only is it bending around the gravity lens, but it is also striking the solid body which creates the gravity lens. Could be a unique property of not having an antiparticle counterpart.
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