An optical communication system, having an operating wavelength λ , can use only x % of its source frequency as its channel band width. The system is to be used for transmitting TV signals requiring a bandwidth of F hertz. Number of channels transmit simultaneously, is Cx(10×y)λF then y is

Optical frequency  =  CλHZBand width of channel  =x100Cλ=xC100λBand width needed per channel = FNumber of channels =Total band width of channelBandwidth needed per channel                                     =xC100λF=xC100λF   According to given data,    xC100λF=Cx(10×y)λF ⇒100=10y ⇒y=10010=10