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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:c77b859962fb938dcd11a74749cd47ac07047d0f8605a1cc5e5320189808ac31"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 27 Polarisation of light "
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 27.1 Page no 758"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "u=1.536\n",
+      "\n",
+      "#Calculation\n",
+      "import math\n",
+      "p=math.atan(u)*180/3.14\n",
+      "r=90-p\n",
+      "\n",
+      "#Result\n",
+      "print\"Angle of refraction is\", round(r,1),\"degree\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Angle of refraction is 33.0 degree\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 27.2 Page no 758"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "p=60                 #degree\n",
+      "\n",
+      "#Calculation\n",
+      "import math\n",
+      "u=math.tan(p*3.14/180.0)\n",
+      "C=1/u\n",
+      "C1=math.asin(C)*180/3.14\n",
+      "\n",
+      "#Result\n",
+      "print\"Critical angle is\", round(C1,1),\"Degree\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Critical angle is 35.3 Degree\n"
+       ]
+      }
+     ],
+     "prompt_number": 24
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 27.3 Page no 758"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "a=60                     #degree\n",
+      "b=100\n",
+      "\n",
+      "#Calculation\n",
+      "import math\n",
+      "a1=90-a\n",
+      "A=a/2.0\n",
+      "I=(math.cos(A*3.14/180.0)**2)/2.0\n",
+      "I0=b*I\n",
+      "\n",
+      "#result\n",
+      "print\"Unpolarised light is\", round(I0,1),\"%\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Unpolarised light is 37.5 %\n"
+       ]
+      }
+     ],
+     "prompt_number": 30
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file