As a kid we were very much amused by the video games. We remained glued to the TV screen for hours to play these games like Mario, Contra, donkey Kong and many more. But the game which fascinated me was the Duck Hunt, in a sense that how in the world duck is killed only if the zapper gun or video game gun is aimed towards the duck.
So, how does exactly that video game gun works? Why it only kills ducks only if we pull the trigger aiming towards the duck only otherwise it flies away….
The construction of the gun contains a circuit with a photo-diode (transducer device which converts light signal to electrical signals).
The working of this zapper gun is simple enough. So, as soon as we pull the trigger on the gun the TV screen becomes black for a single frame and the areas where ducks are present remains white . Now this frame transition happens in such a split of the second that this cannot be noticed by the naked eyes.
The zapper if aimed towards the duck (i.e. the white patches), the photo-diode then converts this light signal to the electrical signal and sends the information to kill the ducks. Now, if the aim is wrong and the gun if facing towards the black frame, no light signal is caught by the photo-diode (since black screen does not emit any light) i.e. no signal is generated and the ducks remains flying.
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