step 2 : when a printed page is photocopied, UV light is reflected off the page and projected onto the drum. the white part of the page reflect intense light to some parts of the drum , making these areas conducting and thereby lose their charge. oher part of the drum, corresponding to the black parts of the page, receive no light at all. they remain insulating and hold on to their charge so the drum ends up with a pattern or charged areas which is an exact copy of the pattern of printing on the original page