Abstract
Whether or not perfect imaging is obtained in the mirrored version of Maxwell's fisheye lens is debated in the comment/reply sequence (Blaikie 2010 New J. Phys. 12 058001; Leonhardt 2010 New J. Phys. 12 058002) discussing Leonhardt's original paper (Leonhardt 2009 New J. Phys. 11 093040). Here, we show that causal solutions can be obtained without the need for an ‘active localized drain’, contrary to the claims made by Leonhardt (2010 New J. Phys. 12 058002).
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