initial commit / add all books

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diff --git a/3537/CH1/EX1.8/Ex1_8.sce b/3537/CH1/EX1.8/Ex1_8.sce
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+//Example 1_8
+clc; 
+clear;
+//To Calculate the Angular position of the 10th maximum and first minimum
+//The distance from centre where 10th maximum is obtained by
+lamda=5460                 //units in angstrom
+lamda=5460*10^-10          //units in mts
+n=10
+d=0.1                     //units in mm
+d=0.1*10^-3               //units in mts
+D=2                      //units in mts
+x10=(n*lamda*D)/d        //units in mts
+//angular position with respect to center is
+tantheta=(x10/D)           //units in radians
+z=atan(tantheta)*(180/%pi)     //units in degrees
+printf("Angular position of 10th maximum is theta=%.3f degrees",z)
+x1=(lamda*D)/(2*d)             //units n mts
+printf("\n The distance from centre where 1st minimum is obtained is %f metres",x1)
+tantheta1=(x1/D)           //units in radians
+z1=atan(tantheta1)*(180/%pi)     //units in degrees
+printf("\n Angular  position with respect to center is theta=%.3f degrees",z1)
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diff --git a/3537/CH1/EX1.8/Ex1_8.txt b/3537/CH1/EX1.8/Ex1_8.txt
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+Angular position of 10th maximum is theta=3.125 degrees

+ The distance from centre where 1st minimum is obtained is 0.005460 metres

+ Angular  position with respect to center is theta=0.156 degrees 
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