See Also: Porro prism(dictionary)
Porro, Edoardo(medicine)
Porro hysterectomy(medicine)
Porro operation(medicine)
prism(dictionary)
prism bar(medicine)
prism(dictionary)
Prism(medicine)
prism(encyclopedia)
tidal prism(medicine)

Porro prism (iou)



Porro prism noun phr. Also porro prism. M20.
[Ignazio Porro (1801-75), Italian scientist.]
A reflecting prism in which the light is reflected on two 45 degree surfaces and returned parallel to the incoming beam. Also, (in pl.) a pair of binoculars using two such prisms at right angles, resulting in a conventional instrument with objective lenses that are further apart than the eyepieces.