Compound microscopes are described in which the first magnification is produced by reflexion from the back surface of a lithium fluoride meniscus lens, followed by a further dioptric magnification through fused quartz hemispherical lenses and a Ramsden form eyepiece corrected for ultra-violet light. The optical system is so designed that when focused in visible green light it is simultaneously in focus in ultra-violet light. Specifications are given and tables of the aberrations. The N.A. of the systems are 0.84 and 1.27.
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Brian K. Johnson (1949) studied this question.