The dominant mode of communication today uses antennas to transmit information carrying high frequency signals using antennas which at the receive site produce an electrical signal which is amplified and demodulated by the receiver equipment. However this form of communication is limited by line of sight propagation limiting the range …

A digital camera is a camera that captures photographs in digital memory. Most cameras produced today are digital, largely replacing those that capture images on photographic film.   Digital and digital movie cameras share an optical system, typically using a lens with a variable diaphragm to focus light onto an …