// Scilab Code Ex2.2:: Page-2.10 (2009)
clc; clear;
d = 0.2; // Separation between the slits, cm
D = 100;    // Distance of the source from the screen, m
b = 0.35e-01;    // Fringe separation, cm
lambda = b*d/D;  // Wavelength of light used, m
printf("\nThe wavelength of the light = %3.1e cm", lambda);

// Result 
// The wavelength of the light = 7.0e-005 cm