Optical and Reflective Characteristics Measurement and Focal Length Calculation of a Hollow Tetrahedral Corner and a Solid Highly Retroreflective Cubes

Corner cubes are one of the most important optical tools used in new optical devices and optical LIDAR. This paper compares two different designs of the hollow and solid tetrahedral corner cubes and determines the relation between the Retroreflection index and the surface quality N and the surface flatness N and its effect on the focal length of the hollow and solid corner cube.

the corner of narrator in the novel alablah to dostoveskey

The most important thing in study thinking of narrator corner in the novel (alablah)to dostoveskey it is three cases the narrator is bigger than the oratorical character in the first case.(to regared from back ).the narrator appeared dominating topical and bossed by sinkhole of events the narrator depends on structure in order to show conscience of absent the narrator can from flexibilities in display of there by distance comes down among him and between what discusses.the narrator was in the second case equivalent to oratorical character (thinking with characters).the narrator considers in this case the character there by the subjectivity sprouted in addition to the context of talking depeds on the conscience of speaker.the third case the narrator is smaller than (to regard from exterior here it emeged the exterior description (neuter)to movement of characters and their converses in addition to description of sensory sences.

The Retroreflection Index of Optical and Opto-electronical Systems

The retroreflection phenomenon takes place in all optical and optoelectronical devices and systems that use optical detectors, mirrors, CCD cameras, filters, or glasses in the focal point and in the optical measurement instruments, in general, provided that some of their optical components are retroreflective to light even for small apertures. The article studies a precise method to measure the retroreflection index of optical, opto-electronical systems, and treats the optical retroreflections which are used in applied research of light with various lasers such as: Nd:YAG first and second harmonics, He-Ne, and laser diodes. We have studies the conformity of our results to the theory of retroreflectors. We found that the retroreflection coefficient depends on laser wavelength. The article points out that at 532nm laser wavelength the retroreflection is greater than at 1064nm laser wavelength. The results of this paper can be used in applied research, and led to description of a mathematical relationship between the retroreflection index and laser wavelength.