两个平面镜mn之间的夹角为θ入射光线与镜面m平行经过两个平面镜反射后反射光线与镜面n平行则θ的大小为 A.90°b.60°c Template




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tomski两个平面镜mn之间的夹角为θ入射光线与镜面m平行经过两个平面镜反射后反射光线与镜面n平行则θ的大小为 a.90°b.60°c coloring