Fixed typo

book/pages/waveguides.ipynb

@@ -65,7 +65,7 @@
     "\n",
     "$$n_1 \\sin \\theta_1 = n_2 \\sin \\theta_2$$\n",
     "\n",
-    "We might imagine that there is some critical angle at which the transmitted wave is aligned with the interface between the two media, at which angle, the wave is no longer transmitted into the second medium, but is instead totally reflected back into the first medium. At such an angle, $\\theta_2$ would be 90 degrees:\n",
+    "We might imagine that there is some critical angle at which the transmitted wave is aligned with the interface between the two media, at which angle, the wave is no longer partially transmitted into the second medium, but is instead totally reflected back into the first medium. At such an angle, $\\theta_2$ would be 90 degrees:\n",
     "\n",
     "$$n_1 \\sin \\theta_c = n_2 \\sin 90°$$\n",
     "Solving for the critical angle, we get:\n",