The invariable loss comes from the materials and surface processing of the system itself, such as the loss of Fresnel, ball aberration, diffraction, chromatic aberration and absorb.
Various loss factors which may occur when the Fresnel lens is used to improve the utilization of solar energy are analyzed experimentally.
通过实验，分析了菲涅尔透镜在提高太阳能利用率时的各种损失因素。
3
The mode discrimination and loss characteristics of unstable optical resonators with higher Fresnel number are analysed using theories of geometric-optics and interferometer.