fixed typo

book/pages/ray_optic_model.ipynb

@@ -19,7 +19,7 @@
    "metadata": {},
    "source": [
     "# Supported Modes\n",
-    "The following animation depicts how light interacts with the waveguide at some anagle. The white beam represents the light which has been sent into the waveguide. The orthoganal blue and red lines represent the wavefronts of the light at intervals of 1/2 a wavelength. The blue represents peaks in the amplitude and the red represents troughs in the amplitude. Pay special attention to how these values are swapped upon reflections. Let the electric field be orthogonal to the white line and the wavefronts, such that we have TE polarized light, or in other words, the electric field is coming straight out of the page. It is also important to clarify that the entire animation represents only a point in time and that the reason the white beam is drawn incrementall is to help visualize the angle of the light and how it relates to the wavefronts.  \n",
+    "The following animation depicts how light interacts with the waveguide at some angle. The white beam represents the light which has been sent into the waveguide. The orthoganal blue and red lines represent the wavefronts of the light at intervals of 1/2 a wavelength. The blue represents peaks in the amplitude and the red represents troughs in the amplitude. Pay special attention to how these values are swapped upon reflections. Let the electric field be orthogonal to the white line and the wavefronts, such that we have TE polarized light, or in other words, the electric field is coming straight out of the page. It is also important to clarify that the entire animation represents only a point in time and that the reason the white beam is drawn incrementall is to help visualize the angle of the light and how it relates to the wavefronts.  \n",
     "\n",
     "With all this a backdrop, it is clear that there will be considerable destructive interference between the wavefronts and the reflected wavefronts. This is why light does not propagate well through a waveguide at most angles: most of the light will be lost due to destructive interferrence. \n",
     "<div style=\"text-align: center;width: 400px;margin: auto\">\n",