| abstract |
Various optical apparatus, in particular embodiments, may provide a source of parallel light ( 7, 75 ). The parallel light ( 7, 75 ) may be generally achieved by directing an incident beam at the apex of a prism ( 1, 22, 24, 26, 28 ). The prism may have varying configurations. One configuration has a forward conical face ( 24 ). Another configuration has a pyramidal forward end ( 22 ). Other configurations are also disclosed. Various optical methods and methods for flow cytometry are also disclosed. |