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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:1c07cbfc0dc96926ceae744a226fe3c57743d67509eccb306df708f4c814b436"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "8: Polarisation"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 8.1, Page number 16"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "mew_e=1.553;     #refractive index of extraordinary ray\n",
+      "mew0=1.544;    #refractive index of ordinary ray\n",
+      "lamda=6*10**-7;    #wavelength(m)\n",
+      "\n",
+      "#Calculation\n",
+      "t=lamda/(4*(mew_e-mew0));   #thickness of quarter wave plate(m)\n",
+      "\n",
+      "#Result\n",
+      "print \"thickness of quarter wave plate is\",round(t*10**5,3),\"*10**-5 m\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "thickness of quarter wave plate is 1.667 *10**-5 m\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 8.2, Page number 16"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "mew_e=1.553;     #refractive index of extraordinary ray\n",
+      "mew0=1.544;    #refractive index of ordinary ray\n",
+      "lamda=6*10**-7;    #wavelength(m)\n",
+      "\n",
+      "#Calculation\n",
+      "t=lamda/(2*(mew_e-mew0));   #thickness of half wave plate(m)\n",
+      "\n",
+      "#Result\n",
+      "print \"thickness of half wave plate is\",round(t*10**5,2),\"*10**-5 m\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "thickness of half wave plate is 3.33 *10**-5 m\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 8.3, Page number 17"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "mew_e=1.486;     #refractive index of extraordinary ray\n",
+      "mew0=1.658;    #refractive index of ordinary ray\n",
+      "lamda=6*10**-7;    #wavelength(m)\n",
+      "\n",
+      "#Calculation\n",
+      "t=lamda/(4*(mew0-mew_e));   #thickness of quarter wave plate(m)\n",
+      "\n",
+      "#Result\n",
+      "print \"thickness of quarter wave plate is\",round(t*10**7,1),\"*10**-7 m\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "thickness of quarter wave plate is 8.7 *10**-7 m\n"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 8.4, Page number 17"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "mew_e=1.486;     #refractive index of extraordinary ray\n",
+      "mew0=1.658;    #refractive index of ordinary ray\n",
+      "t=1.64*10**-6;   #thickness(m)    \n",
+      "\n",
+      "#Calculation\n",
+      "lamda=2*t*(mew0-mew_e);   #wavelength of light(m)\n",
+      "\n",
+      "\n",
+      "#Result\n",
+      "print \"wavelength of light is\",round(lamda*10**6,3),\"*10**-6 m\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "wavelength of light is 0.564 *10**-6 m\n"
+       ]
+      }
+     ],
+     "prompt_number": 15
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file