Hyperbolic cone-channel condenser.
An optical condensing system is described that consists of a lens and the polished interior of a cone generated by rotating a hyperbola about an appropriate axis. An optimum concentration of light is achieved in a relatively compact system. In certain circumstances the hyperbola reduces to a straight line, simplifying the construction of the cone.
Gush
H P
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Department of Physics, University of British Columbia, Vancouver, BC, Canada.