Ethics in photojournalism means showing what two traits?

From time to time when I read about Street Photography, I hear the opinion that street photographers exploit people on the street by taking their picture without asking. This opinion raises some valid questions about the ethics of Street Photography, but also shows the double standards we follow in the media.

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.