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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:960fd108c21eb5121a849117765bbc8e0d88eb94076f3988470cabfdb760bcc0"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter8-Polarization"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex2-pg200"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "##Example 8.2\n",
+      "##Polarizer,calculation of angle\n",
+      "\n",
+      "##given values\n",
+      "Io=1.;##intensity of polarised light\n",
+      "I1=Io/2.;##intensity of beam polarised by first by first polariser\n",
+      "I2=Io/3.;##intensity of light polarised by second polariser\n",
+      "\n",
+      "\n",
+      " ##calculation\n",
+      "a=math.acos(math.sqrt(I2/I1));\n",
+      "alpha=a*180./math.pi;##conversion of angle into degree\n",
+      "print'%s %.1f %s'%('angle between characteristic directions  (in degree) is',alpha,'');"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "angle between characteristic directions  (in degree) is 35.3 \n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex3-pg209"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "##Example 8.3\n",
+      "##calculation of birefringence\n",
+      "\n",
+      "##given values\n",
+      "\n",
+      "l=6*10**-7.;##wavelength of light in metre\n",
+      "d=3*10**-5.;##thickness of crystal\n",
+      "\n",
+      "\n",
+      " ##calculation\n",
+      "x=l/(4.*d);\n",
+      "print'%s %.3f %s'%('the birefringance of the crystal is',x,'');"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "the birefringance of the crystal is 0.005 \n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file