About: http://webisa.webdatacommons.org/417697465

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Interposed in the optical path are optical elements such as mirrors which are spaced from one another along the optical path so as to create virtual images on the screen that appear to be at different distances from the trainee.
http://www.w3.org/ns/prov#wasQuotedFrom	radaris.com