1 files changed, 267 insertions, 0 deletions
diff --git a/Engineering_Physics_By_G_Vijayakumari/Chapter6.ipynb b/Engineering_Physics_By_G_Vijayakumari/Chapter6.ipynb
new file mode 100755
index 00000000..7c2ac18d
--- /dev/null
+++ b/Engineering_Physics_By_G_Vijayakumari/Chapter6.ipynb
@@ -0,0 +1,267 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "#6: Fiber Optics"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 6.1, Page number 146"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The critical angle is 75 degrees 23 minutes\n",
+      "The acceptance angle is 22 degrees 56 minutes\n",
+      "The numerical aperture is 0.3899\n",
+      "answer varies due to rounding off errors\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "n1=1.545;    #refractive index of optical fibre core\n",
+    "n2=1.495;    #refractive index of cladding\n",
+    "\n",
+    "#Calculation\n",
+    "CA=math.asin(n2/n1);    #critical angle(radian)\n",
+    "CA=CA*180/math.pi;      #critical angle(degree)\n",
+    "CAm=int(CA);\n",
+    "CAs=int(60*(CA-CAm));\n",
+    "AA=math.asin(math.sqrt(n1**2-n2**2));   #acceptance angle(radian)\n",
+    "AAd=AA*180/math.pi;      #acceptance angle(degree) \n",
+    "AAm=int(AAd);\n",
+    "AAs=int(60*(AAd-AAm));\n",
+    "NA=math.sin(AA);    #numerical aperture\n",
+    "\n",
+    "#Result\n",
+    "print \"The critical angle is\",CAm,\"degrees\",CAs,\"minutes\"\n",
+    "print \"The acceptance angle is\",AAm,\"degrees\",AAs,\"minutes\"\n",
+    "print \"The numerical aperture is\",round(NA,4)\n",
+    "print \"answer varies due to rounding off errors\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 6.2, Page number 147"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 17,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The numerical aperture is 0.3487\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "n1=1.54;    #refractive index of optical fibre core\n",
+    "n2=1.5;     #refractive index of cladding\n",
+    "\n",
+    "#Calculation\n",
+    "NA=math.sqrt(n1**2-n2**2);    #numerical aperture\n",
+    "\n",
+    "#Result\n",
+    "print \"The numerical aperture is\",round(NA,4)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 6.3, Page number 147"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 25,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The critical angle is 71 degrees 30 minutes\n",
+      "The acceptance angle is 29 degrees 26 minutes\n",
+      "The numerical aperture is 0.4915\n",
+      "answer for acceptance angle and numerical aperture given in the book is wrong\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "n1=1.55;    #refractive index of optical fibre core\n",
+    "n2=1.47;    #refractive index of cladding\n",
+    "\n",
+    "#Calculation\n",
+    "CA=math.asin(n2/n1);    #critical angle(radian)\n",
+    "CA=CA*180/math.pi;      #critical angle(degree) \n",
+    "CAm=int(CA);\n",
+    "CAs=int(60*(CA-CAm));\n",
+    "NA=math.sqrt(n1**2-n2**2);    #numerical aperture \n",
+    "AA=math.asin(NA);   #acceptance angle(radian)\n",
+    "AAd=AA*180/math.pi;      #acceptance angle(degree) \n",
+    "AAm=int(AAd);\n",
+    "AAs=int(60*(AAd-AAm));\n",
+    "\n",
+    "#Result\n",
+    "print \"The critical angle is\",CAm,\"degrees\",CAs,\"minutes\"\n",
+    "print \"The acceptance angle is\",AAm,\"degrees\",AAs,\"minutes\"\n",
+    "print \"The numerical aperture is\",round(NA,4)\n",
+    "print \"answer for acceptance angle and numerical aperture given in the book is wrong\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 6.4, Page number 147"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 31,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The refractive index of optical fibre is 1.5628\n",
+      "The numerical aperture when fibre is in water is 0.15\n",
+      "The Acceptance angle for the fibre in water is 8 degrees 38 minutes\n",
+      "answer for minutes varies due to rounding off errors\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "n2=1.55;   #refractive index of cladding\n",
+    "no=1.33;   #refractive index of water\n",
+    "NA=0.20;   #numerical aperture of optical fibre\n",
+    "\n",
+    "#Calculation\n",
+    "n1=math.sqrt(n2**2+NA**2);   #refractive index of optical fibre\n",
+    "NAW=math.sqrt(n1**2-n2**2)/no;   #numerical aperture when fibre is in water\n",
+    "AA=math.asin(NAW);    #Acceptance angle for the fibre in water(degrees)\n",
+    "AAd=AA*180/math.pi;      #acceptance angle(degree) \n",
+    "AAm=int(AAd);\n",
+    "AAs=int(60*(AAd-AAm));\n",
+    "\n",
+    "#Result\n",
+    "print \"The refractive index of optical fibre is\",round(n1,4)\n",
+    "print \"The numerical aperture when fibre is in water is\",round(NAW,2)\n",
+    "print \"The Acceptance angle for the fibre in water is\",AAm,\"degrees\",AAs,\"minutes\"\n",
+    "print \"answer for minutes varies due to rounding off errors\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 6.5, Page number 148"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 33,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The refractive index of the core of a fibre is 1.42\n",
+      "The refractive index of the cladding is 1.403\n",
+      "answer varies due to rounding off errors\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "NA=0.22;   #numerical aperture of optical fibre\n",
+    "no=0.012;  #refractive index difference\n",
+    "\n",
+    "#Calculation\n",
+    "n1=NA/math.sqrt(2*no);    #The refractive index of the core of a fibre\n",
+    "n2=n1*(1-no);     #The refractive index of the cladding\n",
+    "\n",
+    "#Result\n",
+    "print \"The refractive index of the core of a fibre is\",round(n1,2)\n",
+    "print \"The refractive index of the cladding is\",round(n2,3)\n",
+    "print \"answer varies due to rounding off errors\""
+   ]
+  }
+ ],
+ "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
+}