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diff --git a/3875/CH11/EX11.2/11_2.sce b/3875/CH11/EX11.2/11_2.sce
new file mode 100644
index 000000000..105eed936
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+++ b/3875/CH11/EX11.2/11_2.sce
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+clc;
+clear;
+e=1.6*10^-19 //charge in C
+h=6.63*10^-34 //Plancks constant in J-s
+c=3*10^8 //velocity of light in m/s
+n1=1 //first order maxima
+n2=2 //second order maxima
+V=50*10^3 //voltage in V
+tetha=26 //Braggs angle in degree
+
+//calculation
+lambda_min=(h*c)/(e*V) //wavelength in m
+d=(n1*lambda_min)/(2*sind(tetha))
+mprintf("The interplanar spacing is = %1.2e m\n",d)
+
+tetha2=asind((n2*lambda_min)/(2*d))
+mprintf("The Braggs angle for second order reflection is = %2.1f degree",tetha2) //The answer varies due to round off error.