Optical fibres are used to carry digital signals by means of infrared radiation. The fibres have an average refractive index of $1.50$. Which row describes a digital signal and states the speed of infrared radiation in the fibres?
Physics 0625 · IGCSE · Light
Optical fibres are used to carry digital signals by means of infrared radiation. The fibres have an average refractive index of $1.50$. Which row describes a digital signal and states the speed of infrared radiation in the fibres?