What did von Petzinger find in her studies on geometric signs? Briefly describe some key points.

She studied rock art sites in Europe, where ice age Europeans employed 32 distinct geometric sign types from thousands of years ago. (40,000-10,000) The preliminary findings shocked her. That it may be that the signs origins was from another place.

changeable lenses of different focal lengths allow light to enter the camera, which then forms the image on light-sensitive film" is the one among the following statements about working principle behind a basic still camera is true.