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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