EntityQ742318· pop 21· linked from 79 articlesGregorian telescopeSign in to savetype of reflecting telescopeConnectionsIsaac NewtonPersonmirrorEntityWayback MachineEntityRobert HookeEntityastronomerEntityMarin MersenneEntityfocal lengthEntityBonaventura CavalieriEntityellipsoidEntityfocusEntityparaboloidEntityeyepieceEntityJames GregoryEntityreflecting telescopeEntityArecibo ObservatoryEntityNational Science FoundationEntitydiaphragmEntitytelephoto lensEntityNewton telescopeEntitycurved mirrorEntityCategoriesScottish inventionsTelescope types