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authorEugeniy Mikhailov <evgmik@gmail.com>2014-10-09 17:45:11 -0400
committerEugeniy Mikhailov <evgmik@gmail.com>2014-10-09 17:45:11 -0400
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typo fixed thanks to Calvin
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@@ -107,7 +107,8 @@ so that the red beam goes all the way to the detector slit. The diode laser manu
wavelength is $670 \pm 5$~nm, and its output power is about 5~mW. \emph{\textbf{As long as you don't allow the
full beam to fall directly into your eye, it presents no safety hazard.}} Place a double slit mask on the holder
in the center of the apparatus, and then put your viewing card just after the mask to observe the two ribbons of
-light, just a third of a millimeter apart, which emerge from the two slits. Move you viewing card along the beam
+light, just a third of a millimeter apart, which emerge from the two slits.
+Move your viewing card along the beam
path to see the interference pattern forming. By the time your viewing card reaches the right-hand end of the
apparatus, you'll see that the two overlapping ribbons of light combine to form a pattern of illumination
displaying the celebrated ``fringes'' named after Thomas Young.