undulatory theory

[TimothynTep]

(physics) the theory that light is transmitted as waves

[RobertFaw]

Undulatory theory, also known as wave theory, is a fundamental concept within the field of physics that suggests certain physical phenomena such as light or sound propagate through space in the form of waves. The wave or undulating movement is typically characterized by oscillation or vibration about a fixed point with transference of energy from one point to another. This theory contrasts with the corpuscular theory which sees light, for example, as being composed of particles.

[soniportgo]

the theory that light is due to vibrations or undulations in the ether as the medium through which it is transmitted from its source in a luminous body.