About: http://webisa.webdatacommons.org/124770288

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	Also, since the return beam is a mirror image of the original beam, the grating diffracts only the desired frequency of light and reflects it to the exit slit.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca