Bifocal dual magnification microscope - has two closely juxtaposed eyepieces alternately viewable by same eye

摘要

The microscope has two closely juxtaposed eyepieces alternately viewable by the same eye, the light passing through a common objective to the eye-pieces by way of separate optical paths with different image magnification. The two paths are of different geometrical length; in the case of identical eyepieces, a supplemental lens may be included in one of them to compensate for the difference in path length. The ligh beam traversing the objective may be divided into two portions, propagating along these paths, by a beam splitter establishing between the two beam portions an intensity ratio substantially equaling the ratio of the squares of the respective magnifications.