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Sampling of speckle grains in optical time-reversal experiments. a. Phase map of the scattered light on the rear surface of a scattering medium. b. Phase map of the under-sampled speckle grains, which looks different from the real one in a. c. Phase map of the 400× magnified speckle grains. d. Phase map of the well-sampled speckle grains. e. Magnifying the speckle size by an iris and a lens. f. Magnifying the speckle size by two objective lenses.
