PentaPrismisafive-sidedprismcontainingtworeflectingsurfacesat45?toeachother,andtworefractingfacesperpendiculartotheenteringandemergingbeams.Thedeviationangleof90degisthusindependentoftheorientationoftheprism,makingitespeciallyimportantinapplicationsinwhichtheprismorientationcannotbepreciselycontrolled.Duetothegeometrythattotalinternalreflectioncannotbeused,thereflectingsurfacesmustbecoatedwithametallicordielectriccoating.ThestandardPentaPrismreflectingsurfacesarecoatedwithaluminumorenhancedaluminum.Thecoatedsurfacescanbepaintedblack.Thepentaprismisafive-sidedprism.Itreflectslightraysthrougha90 anglebytworeflectionsanddoesinvertorreverttheimage.Thereflectingsurfacesarealuminized.Slightmovementoftheprismdoesnotaffectthetruerightangleatwhichlightraysarereflected.Italsoshortenstheopticalpathlengthofaninstrument.Specifications:Material:BK7DiameterTolerance:+0.0,-0.2mmAngularTolerance:seethetableasfollowFlatness:l/2@632.8nmSurfaceQuality:60/40ClearAperture: 80%Bevel: 0.25mmX45 Coating:*S1 S2:SinglelayerMgF2coating*S3 S4:Aluminizedandpaintedblack Deminsion(mm)Axh30Sec.Deviation10Sec.DeviationPartNo.PartNo.7x5PTP1-201PTP1-3017x6PTP1-202PTP1-30210x10PTP1-203PTP1-30315x15PTP1-204PTP1-30420x20PTP1-205PTP1-30530x30PTP1-206PTP1-306