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diff --git a/3537/CH1/EX1.11/Ex1_11.sce b/3537/CH1/EX1.11/Ex1_11.sce
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index 000000000..ad3b8ce41
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+++ b/3537/CH1/EX1.11/Ex1_11.sce
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+//Example 1_11
+clc();
+clear;
+//To find the refractive index of oil
+v=0.2      //units in cm
+area=1  //units in m^2
+area=area*10^4   //units in cm^2
+t=v/area    //units in cm
+n=1
+lamda=5.5*10^-5      //units in cm
+r=0      //units in degrees
+u=(n*lamda)/(2*t*cos(r))
+printf("Refractive index of oil is u=%.2f",u)
diff --git a/3537/CH1/EX1.11/Ex1_11.txt b/3537/CH1/EX1.11/Ex1_11.txt
new file mode 100644
index 000000000..160ebbd88
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+Refractive index of oil is u=1.38 
+\ No newline at end of file