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diff --git a/3411/CH1/EX1.4/Ex1_4.sce b/3411/CH1/EX1.4/Ex1_4.sce
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+++ b/3411/CH1/EX1.4/Ex1_4.sce
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+//Example 1.4
+clc();
+clear;
+//To calculate thickness of plate
+//t=(n*lamda)/(u-u1)
+n=5
+u=1.7
+u1=1.4
+lamda=4800        //units in armstrongs
+lamda=lamda*10^-10   //units in mts
+t=(n*lamda)/(u-u1)       //units in mts
+printf("Thickness of glass plate is %.6fmts",t)
+//In text book the answer is printed wrong as 8*10^-8 mts     
+//the correct answer is 8*10^-6   mts
diff --git a/3411/CH1/EX1.4/Ex1_4.txt b/3411/CH1/EX1.4/Ex1_4.txt
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+Thickness of glass plate is 0.000008mts   
+\ No newline at end of file