象散法轴向定位系统如图所示。L1焦距=1mm,L2焦距=20mm,柱面镜焦距=7.5mm,L1和L2间距离=40mm,L2与柱面镜间距=5mm,求当物体位于L1焦点上时,平面b与柱面镜间距离为:
A2.5mm
B5.0mm
C7.5mm
D10.0mm
象散法轴向定位系统如图所示。L1焦距=1mm,L2焦距=20mm,柱面镜焦距=7.5mm,L1和L2间距离=40mm,L2与柱面镜间距=5mm,求当物体位于L1焦点上时,平面b与柱面镜间距离为:
A2.5mm
B5.0mm
C7.5mm
D10.0mm
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