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photocathode

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Fabry lens

Fabry lens  

A small lens placed within a photometer to provide an image of the telescope's objective lens on the photocathode. It is placed behind a mask in the focal plane of the objective, which isolates the ...
photomultiplier

photomultiplier  

An evacuated electronic tube which converts light into a measurable electric current. Light falling on a photocathode releases electrons, which are accelerated by an electric field and attracted to ...

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