initial commit / add all books

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diff --git a/1271/CH2/EX2.6/6.txt b/1271/CH2/EX2.6/6.txt
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+

+ Radius of first ,second and third half period zone = 7.676588e-04,1.329624e-03 and 1.716537e-03 meter. 

diff --git a/1271/CH2/EX2.6/example2_6.sce b/1271/CH2/EX2.6/example2_6.sce
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+clc 
+// Given that
+lambda = 5.893e-7 // wavelength of light in meter
+f = 1 // focal-length of convex lens in meter
+n1 = 1 // no. of first half period zone
+n2 = 3 // no. of second half period zone
+n3 = 5 // no. of third half period zone
+// Sample Problem 6 on page no. 2.40
+printf("\n # PROBLEM 6 # \n")
+R1 = sqrt(n1 * lambda * f) // calculation for Radius of first half period zone
+R2 = sqrt(n2 * lambda * f) // calculation for Radius of second half period zone
+R3 = sqrt(n3 * lambda * f) // calculation for Radius of third half period zone
+printf("Standard formula used \n R = sqrt(f*n*lambda)\n")
+printf("\n Radius of first ,second and third half period zone = %e,%e and %e meter. ",R1,R2,R3)