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-rw-r--r--single-photon-interference.tex2
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diff --git a/single-photon-interference.tex b/single-photon-interference.tex
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@@ -13,7 +13,7 @@
\section*{History}
There is a rich historical background behind the experiment you are about to perform. Isaac Newton first
-separated white light into its colors, and in the 1680's hypothesized that light was composed of `corpuscles',
+separated white light into its colors, and, in the 1680's, hypothesized that light was composed of `corpuscles',
supposed to possess some properties of particles. This view reigned until the 1800's, when Thomas Young first
performed the two-slit experiment now known by his name. In this experiment he discovered a property of
destructive interference, which seemed impossible to explain in terms of corpuscles, but is very naturally