A light wave is a type of electromagnetic wave. Light waves on the electromagnetic spectrum include those that are visible as well as those that are invisible to the human eye.
invade, occupy(verb) march aggressively into another's territory by military force for the purposes of conquest and occupation. Synonyms: lodge in, invade, occupy, encroach upon, engross, obtrude upon, intrude on, busy, worry, absorb, engage, reside, concern, overrun, fill, infest, interest, take, use up.
Intrusion(noun) the act of intruding, or of forcing in; especially, the forcing (one's self) into a place without right or welcome; encroachment. Intrusion(noun) the penetrating of one rock, while in a plastic or metal state, into the cavities of another.