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diff --git a/1397/CH1/EX1.12/1_12.sce b/1397/CH1/EX1.12/1_12.sce
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+//clc();
+clear;
+// To determine the thickness of the glass plate
+lambda=6000*10^(-8);         //wavelength of parallel beam of light in centimetres
+mew=1.5;             //refractive index of glass plate
+r=50;                //angle of refraction in degrees
+n=1;                 //for least thickness
+t=(n*lambda)/(2*mew*cosd(r));
+printf("the least thickness of the glass plate in centimetres which will appear dark by reflection is %f cm",t);