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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 16 Microwaves and Lasers"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 16.1 Page no 753"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#given\n",
+      "h=0.3                    #curve depth of parabolic reflector\n",
+      "D=3                      #diameter of parabolic reflector\n",
+      "\n",
+      "#calculation\n",
+      "f=D/(16*h)               #focal \n",
+      "\n",
+      "#result\n",
+      "print\"The focal length is \",f,\" m out from the center of the parabolic reflector\"\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The focal length is  0.625  m out from the center of the parabolic reflector\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 16.2 Page no 755"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#given\n",
+      "D=3.0                    #diameter of microwave dish\n",
+      "k=0.6                    #efficiency of reflector\n",
+      "c=2.997925*10**8         #velocity of light\n",
+      "f=10.0*10**9             #frequency\n",
+      "\n",
+      "#calculation\n",
+      "import math\n",
+      "Ap=10*math.log10((c/f)*k*((math.pi*D)**2/(c/f)**2))      #powergain\n",
+      "B=(70*(c/f))/D                                         #beamwidth\n",
+      "\n",
+      "#result\n",
+      "print\"beamwidth = \",round(B,3),\"micrometer\"\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "beamwidth =  0.7 micrometer\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 16.3 Page no 756"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#given\n",
+      "D=4.5                       #diameter of parabolic reflector\n",
+      "k=0.62                      #efficiency factor\n",
+      "\n",
+      "#calculation\n",
+      "import math\n",
+      "Ae=(k*math.pi)*(D/2.0)**2                       #aperture efficiency\n",
+      "i=(math.pi*(D/2.0)**2)                #ideal capture area\n",
+      "\n",
+      "#result\n",
+      "print\"The ideal capture area for\",D,\"m\",\"1f m parabolic antenna is\",round(i,3),\"sq.m\"\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The ideal capture area for 4.5 m 1f m parabolic antenna is 15.904 sq.m\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file