Results for « 平行光管 » (cmn)
03070587-n
平行光管
,
瞄准仪
,
准直管
,
准直器
,
平行 光管
,
准直仪
collimator
optical device consisting of a tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens; light rays leave the slit as a parallel beam
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