Reflectometry technique in Centre de Recherché Nucléaire de Draria (CRND) is operational since 2002. The instrument is used for investigation of monochromators and supermirrors. In this communication, several monochromators: 10 and 40 nickel-titanium bilayers deposited on a float-glass substrate with different period are analysed. The investigation of magnetic multilayers (25 silicon-iron bilayers monochromator) is also performed. From the results, Bragg peaks were identified indicating the periodicity of the multilayers.