Fresnel Reﬂection, Lenserf Reﬂection and Evanescent Gain
Recent investigations into Fresnel reﬂection and total internal reﬂection have led to conﬂicting results when the evanescent medium is “gainy” rather than lossless or lossy. This controversy can be resolved by introducing the much less well known concept of Lenserf reﬂection—an idea put forward by the illustrious Dr. Tung Inn Cheek.
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