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+//Example 6.5, Page Number 263
+//The Function fpround(dependency) is used to round a floating point number x to n decimal places
+//Coherent lengths of conventional and laser radiation sources
+clc;
+
+//Assuming all lights are emitted from a low pressure Sodium Lamp
+
+l=589*(10**-9) //Wavelength in meter
+lw=5.1*(10**11) //Linewidth in Hertz
+c=3*(10**8) //Speed of light in meters per second
+
+//From equation 6.9
+tc=1/lw //tc is the cavity lifetime in s
+
+//From Equation 6.8
+Lc=tc*c //Lc is the length of the Wave Train in metres
+Lc=fpround(Lc,4)
+
+disp(tc,"The Cavity lifetime in s:")
+disp(Lc," The Length of the Wave Train or the Coherence Length in m is:")
+
+//If Many modes are operating 
+lw=1500*(10**6)//in Hz
+tc=1/lw//tc is the cavity lifetime in s
+Lc=tc*c
+Lc=fpround(Lc,4)//Lc is the length of the Wave Train in metres
+
+disp(tc,"The Cavity lifetime in s:")
+disp(Lc," The Length of the Wave Train or the Coherence Length in m is:")
+
+//If There is only one mode
+lw=1*(10**6)//in Hz 
+tc=1/lw//tc is the cavity lifetime in s
+Lc=tc*c
+Lc=fpround(Lc,4)//Lc is the length of the Wave Train in metres
+
+disp(tc,"The Cavity lifetime in s:")
+disp(Lc," The Length of the Wave Train or the Coherence Length in m is:")