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By Renaud Foy; Françoise-Claude Foy; North Atlantic Treaty Organization. Public Diplomacy Division
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Properties of conics For conic mirrors there is a unique and interesting situation: There exists a pair of points in space located relative to a conic mirror such that the light travel time for all possible paths from one point to the other are equal and minimum. This means that all light leaving one of these points will intersect the other point if it strikes the conic mirror. These points are called conic conjugates. For any given conic there are only two such points, which are different for different conics.
Properties of conics For conic mirrors there is a unique and interesting situation: There exists a pair of points in space located relative to a conic mirror such that the light travel time for all possible paths from one point to the other are equal and minimum. This means that all light leaving one of these points will intersect the other point if it strikes the conic mirror. These points are called conic conjugates. For any given conic there are only two such points, which are different for different conics.
Hence Ritchey’s 70 cm A brief history ofastronomical telescopes 31 mirror was roughly 7 times more difficult to figure than the Melbourne one. Still, Ritchey’s telescope delivered excellent photographic results, outperforming visual observations with much larger refractors. 5-m reflector. Ritchey cautiously opted for a longer primary mirror focal ratio (f/5) than for the 60 cm, but incorporated novel design features such as the possibility to switch between Newton, Cassegrain and Coudé foci 7 . Still in operation today, after numerous upgrades, the telescope will see its 100th birthday in 2008.