i do realize no other media is necessary, like when light can pass through a jar of vacuum. but i don't understand how it can transmit through no media. i can very well visualize a physical particle moving/streaking through no media just by virtue of it initial momentum.

i guess one of the issues i'm finding it hard to reconcile is that waves have been generally taught as disturbance travelling through a medium, where the disturbance in the form of energy is transmitted from one particle to the adjacent one.

for the sake of discussion, i'll propose this set up. consider an opaque plastic/metal pipe of 1m diameter. now, consider one particular stretch of the pipe of length, say 10m, is transparent and the boundaries of that length are sealed off by glass plates. imagine the glass plates being perpendicular to the axis of the pipe. now consider the space bounded by the transparent tube and the glass plates was emptied out, i.e. creating vacuum in that region. now stream red light from one end of the pipe. i believe the red light will pass through that transparent section of the pipe with vacuum and can be see at the other end of the pipe. let's assume the pipe is not bent.

now i fail to understand how light that might be travelling either as particles (photons) or as waves up until the first glass plate travels through the vacuum.

could u explain what happens @ the first glass plate? i want to thank you for your time and energy answering my posts in advance.