Question

Signals take place in the form of light, in ____________

Answer 1

Answer:

Optical communication

Explanation:

Optical communication, also known as optical telecommunication, is communication at a distance using light to carry information. It can be performed visually or by using electronic devices. The earliest basic forms of optical communication date back several millennia, while the earliest electrical device created to do so was the photophone, invented in 1880.

Answer 2

Answer:

variable light of the Stop signal shall take the place of the fixed green light...