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diff --git a/Modern_Physics_By_G.Aruldas/Chapter16.ipynb b/Modern_Physics_By_G.Aruldas/Chapter16.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:8689775b6694dc6c6ea95bc809bbd7280d9553003ec1dbe78844db2dc6fa68f3"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "16: Fibre optics and holography"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 16.1, Page number 306"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "n2=1.4;    #refractive index of cladding\n",
+      "n1=1.43;   #refractive index of core\n",
+      "\n",
+      "#Calculation\n",
+      "costhetac=n2/n1;  \n",
+      "thetac=math.acos(costhetac);     #propagation angle(radian)\n",
+      "thetac=thetac*180/math.pi;    #propagation angle(degrees)\n",
+      "NA=math.sqrt(n1**2-n2**2);   #numerical aperture\n",
+      "thetaa=math.asin(NA);    #angle(radian)\n",
+      "thetaa=thetaa*180/math.pi;    #angle(degrees)\n",
+      "thetaa=2*thetaa;    #acceptance angle(degrees)\n",
+      "\n",
+      "#Result\n",
+      "print \"propagation angle is\",round(thetac,1),\"degrees\"\n",
+      "print \"numerical aperture is\",round(NA,4)\n",
+      "print \"acceptance angle is\",round(thetaa,2),\"degrees\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "propagation angle is 11.8 degrees\n",
+        "numerical aperture is 0.2914\n",
+        "acceptance angle is 33.88 degrees\n"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 16.3, Page number 311"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "z=30;    #length of optical fibre(km)\n",
+      "alpha=0.8;    #fibre loss(dB/km)\n",
+      "Pi=200;   #input power(micro W)\n",
+      "\n",
+      "#Calculation\n",
+      "a=alpha*z/10;\n",
+      "b=10**a;\n",
+      "P0=Pi/b;    #output power(micro W)\n",
+      "\n",
+      "#Result\n",
+      "print \"output power is\",round(P0,3),\"micro W\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "output power is 0.796 micro W\n"
+       ]
+      }
+     ],
+     "prompt_number": 10
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file