耀久九英英词典

exit pupil

E 开头单词

柯林斯词典

    exit pupil

  • 1. N the smallest cross section of the beam of light from the eyepiece of a telescope through which all the light from the eyepiece passes. Its diameter is equal to the ratio of the focal length of the eyepiece to the focal ratio of the telescope 出射光瞳

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