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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 6: Lasers"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 6.1, Page 170"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Variable Declaration\n",
+      "D=4*1e8;#distance between earth and moon in m\n",
+      "lamda=16000.*1e-10;#wavelength in meters\n",
+      "d=1e-3;#aperture in meter\n",
+      "\n",
+      "#Calculations & Result\n",
+      "th=lamda/d;#angular speed\n",
+      "print 'angular speed is=',th,'rad'\n",
+      "aos=(D*th)**2;#area of spread \n",
+      "print 'area of spread is=',aos,'m^2'\n",
+      "#Incorrect answer in the textbook\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "angular speed is= 0.0016 rad\n",
+        "area of spread is= 4.096e+11 m^2\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 6.2, Page 170"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Variable Declaration\n",
+      "a1=2*1e-3;#distance from the laser\n",
+      "a2=3*1e-3;#distance from the laser\n",
+      "d1=2;#output beam spot diameter\n",
+      "d2=4;#output beam spot diameter\n",
+      "\n",
+      "#Calculation\n",
+      "th=(a2-a1)/(2*(d2-d1));#angle of divergence\n",
+      "\n",
+      "#Result\n",
+      "print 'angle of divergence',th/1e-3,'*10^-3 rad'\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "angle of divergence 0.25 *10^-3 rad\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 6.3, Page 171"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Variable Declaration\n",
+      "D=0.1;#focal length of lens\n",
+      "lamda=14400*1e-10;#wavelength in meters\n",
+      "p=100*1e-3;#power of laser beam\n",
+      "d=10*1e-3;#aperture in meter\n",
+      "\n",
+      "#Calculations & Results\n",
+      "th=lamda/d;#angular speed\n",
+      "print 'angular speed is=',th/1e-4,'*10^-4 rad'\n",
+      "aos=(D*th)**2;#area of spread \n",
+      "print 'area of spread is=',aos/1e-10,'*10^-10 m^2'\n",
+      "I=p/aos;#'intensity\n",
+      "print 'intensity is=',round(I/1e7,1),'*10^7 W*m^-2'\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "angular speed is= 1.44 *10^-4 rad\n",
+        "area of spread is= 2.0736 *10^-10 m^2\n",
+        "intensity is= 48.2 *10^7 W*m^-2\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file