The base of a cone of $43^{\circ}$ has 7 concentric thin glass toroidal transparent tubes filled with water and held together in a plane by a vertical frame (like 10 feet size) outer ring resting on ground.. The symmetry axis of cone is a line connecting the standing observer’s eye to circles center. A very rough sketch..
Do the toroidal tubes when filled with water or water mist show rainbow colored rings at any time of the day? It is sometimes said total internal reflection is not necessary for the formation the rainbow.
How should such a toroidal construction be changed in order to see full coloured “Rain” Rings? Appreciate all suggestions/useful hints.
