A Fabry lens is a lens that forms an image of the telescope's primary mirror onto the photocathode of a photomultiplier tube and, in this way, serves as a key element of photometer. A mask, placed in front of it, isolates the object whose light intensity is to be measured. The use of such a lens was first proposed by the French physicist Charles Fabry.
Related category OPTICS AND OPTICAL PHENOMENA
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