La valutazione dell’ingrandimento angolare negli strumenti ottici

This paper analyses an experimental method by which laws of angular magnification, for common optical instruments, are pointed out. Kepler’s and Galilei’s telescopes simple and compound microscopes are analysed with the aid of a TV camera and a monitor. Image sizes are measured on the monitor before and after instrument magnification; for each instrument, angular magnification G is directly computed and then compared with theoretical predictions. Short theoretical notes, an essential explanation of the operational principles of a TV-Camera, the analysis of measurement errors and a photographic documentation conclude the paper.