Between the primary and secondary rainbows, there is a dark band known as Alexandar’s dark band. This is because (a) light scattered into this region interfere destructively. (b) there is no light scattered into this region (c) light is absorbed in this region. (d) angle made at the eye by the scattered rays with respect to the incident light of the sun lies between approximately 42° and 50°.
primary and secondary rainbow. This forms due to the light scattered into this region interfere destructively. Because the primary and secondary rainbows subtend angles (41o to 42o) and (51o to 54o) resepctively at the oberver's eye with respect to incident light ray, so the scattered rays with respect to the incident ray of the sun lies between approximately 42o and 50o.
