This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Parabola svetlometu. en Principle of spotlight function sk Princp funkcie svetlometu pri vytvrani rovnobenho zvzku svetelnch lov pomocou svetelnho zdroja umiestnenho ohnisku paraboly Created by Inkscape by Eduard Drusa VentYl Optical devices
Page 2023 Free-images.com. All images are Public Domain