// Ex15_4 Page:298 (2014) clc;clear; lambda = 693e-009; // Wavelength of laser beam, m D = 3e-003; // Diameter of the mirror, m d = 300e+003; // Height of satellite above the surface of earth, m delta_theta = 1.22*lambda/D; // Angular spread of the laser beam, rad a = delta_theta*d; // Diameter of the laser beam on the satellite, m printf("\nThe angular spread of the laser beam = %4.2e rad", delta_theta); printf("\nThe diameter of laser beam on the satellite = %4.1f m", a); // Result // The angular spread of the laser beam = 2.82e-004 rad // The diameter of laser beam on the satellite = 84.5 m