concave reflecting mirror凹面反射镜
concave spherical mirror[光] 凹球面镜
cylindrical concave mirror柱面凹镜;柱形凹镜
a concave mirror凹镜
concave mirror reflector凹面反光镜
concave mirror focus凹面镜聚焦
concave spherical reflecting mirror凹球面反射镜
plano-concave mirror平凹双面反光镜
the shape of concave mirror凹面镜形状