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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 6: Lasers"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 6.1: example_1.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;\n",
+"clear all;\n",
+"D=4*1e8;//distance between earth and moon in m\n",
+"lemda=16000*1e-10;//wavelength in meters\n",
+"d=1e-3;//aperture in meter\n",
+"th=lemda/d;//angular speed\n",
+"disp('rad',th,'angular speed is=');\n",
+"aos=(D*th)^2;//area of spread \n",
+"disp('m^2',aos,'area of spread is=');\n",
+"//there is variation in the answer than book..checked in calculator too.."
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 6.2: example_2.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;\n",
+"clear all;\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",
+"th=(a2-a1)/(2*(d2-d1));//angle of divergence\n",
+"disp('rad',th,'angle of divergence');"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 6.3: example_3.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;\n",
+"clear all;\n",
+"D=0.1;//focal length of lens\n",
+"lemda=14400*1e-10;//wavelength in meters\n",
+"p=100*1e-3;//power of laser beam\n",
+"d=10*1e-3;//aperture in meter\n",
+"th=lemda/d;//angular speed\n",
+"disp('rad',th,'angular speed is=');\n",
+"aos=(D*th)^2;//area of spread \n",
+"disp('m^2',aos,'area of spread is=');\n",
+"I=p/aos;//'intensity\n",
+"disp('W*m^-2',I,'intensity is=');\n",
+""
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}