Results 21 to 30 of about 1,264,340 (305)
Geometric optics in general relativity using bilocal operators [PDF]
Physical Review D, 2018 We consider the standard problem of observational astronomy, i.e. the observations of light emission from a distant region of spacetime in general relativity. The goal is to describe the changes between the measurements of the light performed by a sample
M. Grasso +2 more
semanticscholar +1 more source
Level of Students Conceptual Understanding and Resource Theory View: Geometric Optics
International Journal of Education and Teaching Zone, 2022 This study aims to identify the level of understanding (LoU) and resources that students activate. This is a descriptive study. The study used a survey method by distributing ten multiple-choice questions. The focus of the study is geometric optics.
Ike Hilma Wahyuni +1 more
doaj +1 more source
Geometrical vs wave optics under gravitational waves [PDF]
, 2015 We present some new derivations of the effect of a plane gravitational wave on a light ray. A simple interpretation of the results is that a gravitational wave causes a phase modulation of electromagnetic waves.
Angélil, Raymond, Saha, Prasenjit
core +1 more source
Propagation and Focusing Properties of Vortex Beams Based on Light Ray Tracing
Frontiers in Physics, 2022 By using the ray-tracing method based on geometric optics, we studied the propagating and focusing characteristics of vortex beams with a top-hat intensity distribution.
Meng-Qiang Cai +4 more
doaj +1 more source
Geometric optics and the “hairy ball theorem”
Results in Physics, 2016 Applications of the hairy ball theorem to the geometrical optics are discussed. When the ideal mirror, topologically equivalent to a sphere, is illuminated at every point, the “hairy ball theorem” prescribes the existence of at least one point at which ...
Edward Bormashenko, Alexander Kazachkov
doaj +1 more source
Observation of a non-adiabatic geometric phase for elastic waves [PDF]
, 2012 We report the experimental observation of a geometric phase for elastic waves in a waveguide with helical shape. The setup reproduces the experiment by Tomita and Chiao [A. Tomita, R.Y. Chiao, Phys. Rev. Lett.
Agarwal +24 more
core +5 more sources
Scattering of ECRF waves by edge density fluctuations and blobs
EPJ Web of Conferences, 2015 The scattering of electron cyclotron waves by density blobs embedded in the edge region of a fusion plasma is studied using a full-wave model. The full-wave theory is a generalization of the usual approach of geometric optics ray scattering by blobs ...
Ram Abhay K., Hizanidis Kyriakos
doaj +1 more source
Quadrature Squeezing and Geometric-Phase Oscillations in Nano-Optics
Nanomaterials, 2020 The geometric phase, as well as the familiar dynamical phase, occurs in the evolution of a squeezed state in nano-optics as an extra phase. The outcome of the geometric phase in that state is somewhat intricate: its time behavior exhibits a combination ...
Jeong Ryeol Choi
doaj +1 more source
Analysis of KVN 21m Radio Antenna Optics using Ray-Tracing Method [PDF]
Journal of Astronomy and Space Sciences, 2009 In this work, we calculate drop in antenna gain, aperture phase distribution, and antenna pointing shift of KVN(Korean VLBI Network) 21m shaped Cassegrain antenna due to misalignments of antenna optics using ray-tracing method.
Jae-Han Bae, Do-Young Byun
doaj +1 more source
Two approaches to the problem of ray seismic tomography
Геофизический журнал, 2015 Approximation of nonlinear geophysical medium as a linear one substantiates a transition to geometrical seismics based on geometric optics. Conditions, necessary and sufficient for application of geometrical optics bring possibility of linearization ...
T.A. Tsvetkova
doaj +1 more source