Such a mirror can be interpreted in terms of the Zeno effect. We may assume that the atom is "absorbed" or "measured" at the ridges. Frequent measuring (narrowly spaced ridges) suppresses the transition of the particle to the half-space with absorbers, causing specular reflection. At large separation L between thin ridges, the reflectivity of the ridged mirror is determined by dimensionless momentum p = K L θ θ , and does not depend on the origin of the wave; therefore, it is suitable for reflection of atoms.