Description: Lecturers are Howard Losty, Managing Director of GEC Electronic Devices Ltd; Steven Cundy, Head of Optical Communications and Lamps Division, GEC Hirst Research Centre and Robert Clayton, Technical Director GEC Ltd (part 2).

Part 2 of this film opens with the topic 'Communication by light' with demonstrations of a heliograph and a general history of communication using light. For example Morse Code via signalling lamps and an explanation on light pulses.

There is a detailed section and explanation on the transmission of information over optical fibres using large-scale models and graphics.

The next topic covered is 'Coherent light' presented by Robert Clayton. This covers orbits and the energy states of atoms and electrons. An explanation of photons. Wave properties of light. Lasers with their applications and a demonstration on how to create a hologram.

There is an interesting discussion on future technology and communicating via electronic letters, remote working and education at home without the need to be on location in person and how using light to communicate will enable this in the future.