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objective lens
This term refers specifically to the primary optical element in a compound system. It is distinguished from the eyepiece or ocular lens, which further magnifies the image created by the objective. In professional laboratory or astronomical settings, the quality and focal length of this lens determine the resolution and magnification power of the entire instrument.
Because this is a compound noun consisting of an adjective and a noun, it follows standard English pluralization rules. It is used almost exclusively in technical, scientific, or optical contexts and does not have a metaphorical or colloquial application.