//Example 1.29 // distance between successive poitions of movable mirror
clc;
clear;
//given data :
w1=5896D-8;//one wavelength of light used in cm
w2=5890D-8;// second wavelength of light used in cm 
d=w1*w2/(2*(w1-w2));// distance between sucessive position of mirror in cm
disp(d,"dustance between sucessive position of mirror in cm")