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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 8: Polarization"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.2: Polarizer.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;clear;\n",
+"//Example 8.2\n",
+"//Polarizer,calculation of angle\n",
+"\n",
+"//given values\n",
+"Io=1;//intensity of polarised light\n",
+"I1=Io/2;//intensity of beam polarised by first by first polariser\n",
+"I2=Io/3;//intensity of light polarised by second polariser\n",
+"\n",
+"\n",
+" //calculation\n",
+"a=acos(sqrt(I2/I1));\n",
+"alpha=a*180/%pi;//conversion of angle into degree\n",
+"disp(alpha,'angle between characteristic directions  (in degree) is');"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.3: calculation_of_birefringence.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;clear;\n",
+"//Example 8.3\n",
+"//calculation of birefringence\n",
+"\n",
+"//given values\n",
+"\n",
+"l=6*10^-7;//wavelength of light in metre\n",
+"d=3*10^-5;//thickness of crystal\n",
+"\n",
+"\n",
+" //calculation\n",
+" x=l/(4*d);\n",
+"disp(x,'the birefringance of the crystal is');"
+   ]
+   }
+],
+"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
+}