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+//Example 1.9
+clc();
+clear;
+//To calculate diameter of the fifth bright ring
+n=5
+lamda=5460    //units in armstrongs
+lamda=lamda*10^-6    //units in cm
+f=400       //units in cm
+u=1.5
+R=(u-1)*2*f     //units in cm
+diameter=sqrt(2*(2*n-1)*lamda*R)
+printf("Diameter of the 5th bright ring is %.4fcm",diameter)
+//In text book the answer is printed wrong as 0.627cm 
+//The correct answer is 6.269 cms