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+//Example 1_17
+clc();
+clear;
+//To calculate the order of interference of the dark band
+t=1.5*10^-6                        //units in cm
+lemda=5*10^-7                   //units in cm
+i=60                            //units in degree
+u=1.33
+r=asin((sin(i*%pi/180))/u)*(180/%pi)    //units in degree
+n=(2*u*t*cos(r*%pi/180))/lemda
+printf("The order of interference of the dark band is %.0f",n)
+//In this question,the thickness and lemda values are given wrong
+//To get the answer i have followed the values that are taken in the answer