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Explore gravitational physics in this 38-minute lecture from the Workshop on "Lensing and Wave Optics in Strong Gravity" at the Erwin Schrödinger International Institute. Delve into the phenomena of gravitational lensing around black holes and compact objects when plasma is present, examining the Hamilton-Jacobi equation's separability criteria for light rays and its implications for photon spheres and shadows of rotating compact objects. Learn about bending angle formulas, multiple imaging conditions, and understand their practical applications in radio astronomy observations. Master key concepts in strong gravity environments while gaining insights into how plasma affects gravitational lensing observations and measurements.
