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diff --git a/Engineering_Physics_by_Shyam_Rajeev/Chapter6.ipynb b/Engineering_Physics_by_Shyam_Rajeev/Chapter6.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:9517150eeae7e7bf9389a01495b7c5d59b808d0c5432252a5c80e780ef687d70"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "6: Fiber Optics"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 6.1, Page number 160"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "n1 = 1.5;      #refractive index of core\n",
+      "n2 = 1.0;      #refractive index of cladding\n",
+      "\n",
+      "#Calculation\n",
+      "thetac = math.asin(n2/n1);      #critical angle(radian)\n",
+      "thetac = thetac*180/math.pi;        #critical angle(degrees)\n",
+      "thetac = math.ceil(thetac*10**2)/10**2;   #rounding off to 2 decimals\n",
+      "\n",
+      "#Result\n",
+      "print \"critical angle is\",thetac,\"degrees\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "critical angle is 41.82 degrees\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 6.2, Page number 160"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "n1 = 1.5;         #refractive index of core\n",
+      "n2 = 1.47;      #refractive index of cladding\n",
+      "\n",
+      "#Calculation\n",
+      "thetac = math.asin(n2/n1);      #critical angle(radian)\n",
+      "thetac = thetac*180/math.pi;        #critical angle(degrees)\n",
+      "thetac = math.ceil(thetac*10**2)/10**2;   #rounding off to 2 decimals\n",
+      "NA = math.sqrt(n1**2-n2**2);           #numerical aperture of fiber\n",
+      "NA = math.ceil(NA*10)/10;   #rounding off to 1 decimal\n",
+      "thetaa = math.asin(NA);        #acceptance angle(radian)\n",
+      "thetaa = thetaa*180/math.pi;        #acceptance angle(degrees)\n",
+      "thetaa = math.ceil(thetaa*10**2)/10**2;   #rounding off to 2 decimals\n",
+      "\n",
+      "#Result\n",
+      "print \"critical angle is\",thetac,\"degrees\"\n",
+      "print \"numerical aperture of fiber is\",NA\n",
+      "print \"acceptance angle is\",thetaa,\"degrees\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "critical angle is 78.53 degrees\n",
+        "numerical aperture of fiber is 0.3\n",
+        "acceptance angle is 17.46 degrees\n"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file