发散物
2.As a case study of Poyang Lake, the divergent process of the indicator system formation has been made to establish the initial indicator set by using the matter-element theory.
3.This point and objective focus of collimation lens are superposition. Though the collimation lens, the beam of light become parallel lights. Then though the Coude Reflector and radiation system of special prism, the lights become a beam of light with 3 ° emanative angle.
