在光源和标本之间是聚光镜。
The condenser is interposed between the light source and the specimen .
在实际工作中，不是用点光源而是用一个扩展光源加一个台下聚光镜以得到一个较亮的象。
In actual practice a brighter image is obtained by using a broad, rather than a point, source along with a substage condenser.
在光源系统中采用球面聚光镜和平面反射镜，可大幅提高光源的利用率。
Adopting spherical mirror and plane mirror can notablely improve the utilization of the light source in the system of light source.
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