Physics - Light and lasers

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Digital signals are a series of pulses with two states - on or off. Light can be used for digital communications, such as in Morse code and CD players. Optical fibres can carry information coded in light waves or infrared waves. Lasers produce intense narrow beams of light.

Light rays change direction if they hit the boundary of the material at an angle other than 90°. Beyond a certain angle, called the critical angle, all the rays reflect back into the glass


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