parallel rays造句

The condition of the normal eye when parallel rays are focused exactly on the retina and vision is perfect
屈光正常当平行光线恰好聚焦于视网膜并形成清晰视觉时正常眼睛的状态
An analysis is made about descartes rays of transparent round - section fibers - a special internal surface reflection rays of the fiber when parallel rays strike the fibers perpendicularly to fiber axis
摘要分析了透明圆形截面纤维在垂直纤维轴光线照射时纱维内表面反射光的一种特殊现象笛卡尔线现象。
It's difficult to find parallel rays in a sentence. 用parallel rays造句挺难的