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.
Keywords from Image Description:
Houghton GC Optic thesavrvs. en Illustration Triplicis uisus directi reflexi refracti de quo optica disputat argumenta From Optic thesaurus by Alhazen lib harvard edu GC Houghton Library Harvard University lib harvard edu GC Houghton Library Harvard Universitybr institution Houghton Library Alhazen author This is media file