Added(A)/Deleted(D) following books

 A  Optical_Fiber_Communication_System_by_Dr._M.K._Raina/chap10.ipynb
A  Optical_Fiber_Communication_System_by_Dr._M.K._Raina/chap2.ipynb
A  Optical_Fiber_Communication_System_by_Dr._M.K._Raina/chap3.ipynb
A  Optical_Fiber_Communication_System_by_Dr._M.K._Raina/chap4.ipynb
A  Optical_Fiber_Communication_System_by_Dr._M.K._Raina/chap5.ipynb
A  Optical_Fiber_Communication_System_by_Dr._M.K._Raina/chap6.ipynb
A  Optical_Fiber_Communication_System_by_Dr._M.K._Raina/chap7.ipynb
A  Optical_Fiber_Communication_System_by_Dr._M.K._Raina/chap8.ipynb
A  Optical_Fiber_Communication_System_by_Dr._M.K._Raina/chap9.ipynb
A  Optical_Fiber_Communication_System_by_Dr._M.K._Raina/screenshots/Sc1.png
A  Optical_Fiber_Communication_System_by_Dr._M.K._Raina/screenshots/sc2.png
A  Optical_Fiber_Communication_System_by_Dr._M.K._Raina/screenshots/sc3.png

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diff --git a/Optical_Fiber_Communication_System_by_Dr._M.K._Raina/chap6.ipynb b/Optical_Fiber_Communication_System_by_Dr._M.K._Raina/chap6.ipynb
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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Ch-6 : Preparation of Optical Fibers and Cables"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex:6.1 Pg: 287"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The percentage of strain =0.16 %\n",
+      "\n",
+      " If this condition is maintained the fiber will maintain without any break\n"
+     ]
+    }
+   ],
+   "source": [
+    "from __future__ import division\n",
+    "r=125*10**-6## cladding radius in meter\n",
+    "R=8*10**-2## curve of radius in meter\n",
+    "s=((R+2*r)/(R+r))-1#\n",
+    "s_p=s*100## percentage of strain\n",
+    "print \"The percentage of strain =%0.2f %%\"%( s_p)#\n",
+    "print \"\\n If this condition is maintained the fiber will maintain without any break\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex:6.2 Pg: 287"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The puttling tension at the exit of an optical cable =49.17 kg\n"
+     ]
+    }
+   ],
+   "source": [
+    "from math import asinh,sinh\n",
+    "from __future__ import division\n",
+    "w=40*10**-3## cable weighing in kg/m\n",
+    "R=20*10**-2## radius of curvature in meter\n",
+    "n=0.19## co-efficient of friction\n",
+    "x=(3.14/4)## angle in rad\n",
+    "si=42.36## pulling tension at the entrance in kg\n",
+    "X=(si/(w*R))##\n",
+    "Y=asinh(si/(w*R))#\n",
+    "Z=w*R*sinh(n*x+Y)##puttling tension at the exit of an optical cable\n",
+    "print \"The puttling tension at the exit of an optical cable =%0.2f kg\"%( Z)"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.9"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}