17-1338

transmittance factor (of a specimen in an optical system) [T]

ratio of flux transmitted by a specimen in a given optical system to the flux transmitted when the specimen is removed from the sampling aperture

Unit: 1

NOTE This is the case when e.g. radiation penetrating a slide situated in a projector and reaching a screen is compared to the radiation when the slide is removed from the projector and only an empty slide mount is in the projector.

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