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【多选题】
下面叙述正确的是?( )
A.
利用球面反射镜中心部分可实现f-θ线性扫描
B.
扫描反射镜与球面镜之间距离0.5f,光斑的弥散圆最小。
C.
利用球面反射镜边缘部分可实现f-θ线性扫描
D.
当抛物反射镜与扫描反射镜之间距离为0.665f时，得到很好的f-θ线性,
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