light light?? hi u guz. heres a confusing question. does light have mass. I have always belived so , but i recieved a confusing argument,:- light may be a wave particle and be effected by gravity, but that is becuz energy and mass are two forms of thesame thing. so light is the form of a packet of energy rather than something that has mass. So Plz help clear this confusion Does light have mass? does a photon hav mass? If not then why is it affected by gravity? Thanks in advance.