a) There should be a half-line difference between odd and even fields in a TV system using interlaced scanning. How is this made possible in practice? b) In a certain country where the power supply...

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Extracted text: a) There should be a half-line difference between odd and even fields in a TV system using interlaced scanning. How is this made possible in practice? b) In a certain country where the power supply frequency is 60 Hz the horizontal oscillator frequency of the monochrome TV system (with interlaced scanning )used was found to be 15.75 kHz. Calculate the no. of lines per frame, the vertical oscillator frequency and the no. of frames per sec.