Newtonian telescope secondary mirror. This design reduces the size and cost of the telescope with a shorter overall telescope tube length (with the corrector extending the focal length in a "telephoto" type layout) combined with a less costly spherical mirror. Commercially produced versions of this design have been noted to be optically compromised due to the difficulty of producing a correctly shaped sub-aperture corrector in a telescope targeted at the inexpensive end of the telescope market. Newtonian telescope The Newtonian telescope, also called the Newtonian reflector or just the Newtonian, is a type of reflecting telescope invented by the English scientist Sir
Emperor and Galilean Emperor and Galilean Emperor and Galilean (in ) is a play written by Henrik Ibsen. Although it is one of the writer's lesser known plays, on several occasions Henrik Ibsen called "Emperor and Galilean" his major work. "Emperor and Galilean" is written in two complementary parts with five acts in each part and is Ibsen's longest play. The play is about the Roman Emperor Julian the Apostate. The play covers the years 351–363. Julian was the last non-Christian ruler of the Roman Empire. It was his desire to bring the empire back to its ancient Roman values. Another crucial and