secondary focal plane 中文意思是什麼
secondary focal plane
解釋
后焦平面-
To minimize harmful diffraction effects, the secondary, or diagonal, mirror is generally only large enough to let the central portion of the focal plane receive light from the whole primary mirror
為減小不利的衍射效應,副鏡,或平面鏡的大小隻是剛夠把主鏡在焦平面的像反射就行了。
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