If the distance from the focus is 10 units and the distance from the directrix is 30 units, then what is the eccentricity?
(a) 0.3333
(b) 0.8333
(c) 1.6667
(d) 0.0333
I have been asked this question in final exam.
The question is from Basics of Conic Sections topic in chapter Curves used in Engineering Practice of Engineering Drawing