光线，光速，法线，反射，折射，平面镜，凹凸面镜，凹凸透镜。
而在另一个实施例中，鞘套在其远端包括凸透镜用于由摄像头使用以获得所述体腔的图像。
只有在近轴光线条件下，平行光通过凸透镜才可近似聚焦于一点。
蒴果（未发育完全）倒锥状，4-5毫米，无毛，先端稍凸出和象的一只凸透镜。
1·Just as a double convex lens enlarges so a double concave lens reduces.
正象双凸透镜可以放大那样，双凹透镜也可以缩小。
2·Wearing lower degree convex lens can reduce incidence rate of myopia in primary school students.
配戴低度凸透镜可降低小学生近视的发生率。
3·In interference experiments with Newton's ring, considered only is the interference of the air film formed between the convex lens and the plain glass.
普通物理实验中，牛顿环干涉实验只考虑在凸透镜与平面玻璃之间形成空气薄膜下的干涉现象。
4·Just AS a double convex lens enlarges, so a double concave lens reduces.
正象双凸透镜可以放大那样，双凹透镜也可以缩小。
5·The detected pyroelectric infrared signal passes through an optical filter and is focused by the swinging convex lens and the infrared focus is also swinging slightly.
被检测的热释电红外信号经过滤光镜片和摆动的凸透镜聚焦后，其红外光焦点同样也进行微幅摆动。