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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:ade43627b2f5d9f9e9fc6f1fe77b719e4d5ca9dd8c4d3cb361adefbae3d62e1a"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 6: Optical Sources LEDs"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 1: PgNo-277"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "\n",
+      "# Initialisation of variables\n",
+      "r=125*math.pow(10,-6) # cladding radius in meter\n",
+      "R=8*math.pow(10,-2) # curve of radius in meter\n",
+      "s=((R+2*r)/(R+r))-1\n",
+      "s_p=s*100 # percentage of strain\n",
+      "\n",
+      "# Results\n",
+      "print ('%s %.2f %s' %(\" The percentage of strain = \",s_p,\"%\"))\n",
+      "print (\"\\n If this condition is maintained the fiber will maintain without any break \")\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " The percentage of strain =  0.16 %\n",
+        "\n",
+        " If this condition is maintained the fiber will maintain without any break \n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 2: PgNo-279"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "\n",
+      "# initialisation of variables\n",
+      "w=40*math.pow(10,-3) # cable weighing in kg/m\n",
+      "R=20*math.pow(10,-2) # radius of curvature in meter\n",
+      "n=0.19 # co-efficient of friction\n",
+      "x=(3.14/4) # angle in rad\n",
+      "\n",
+      "# calculations\n",
+      "si=42.36   # pulling tension at the entrance in kg\n",
+      "X=(si/(w*R))\n",
+      "Y=math.asinh(si/(w*R))\n",
+      "Z=w*R*math.sinh(n*x+Y) # puttling tension at the exit of an optical cable\n",
+      "\n",
+      "# Results\n",
+      "print ('%s %.3f %s' %(\" The puttling tension at the exit of an optical cable = \",Z,\"kg\"))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " The puttling tension at the exit of an optical cable =  49.173 kg\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file