… and twinned rainbows are caused by larger droplets being flattened by air resistance and so refracting light at a different angle. If you’re interested in th

… and twinned rainbows are caused by larger droplets being flattened by air resistance and so refracting light at a different angle. If you’re interested in this sort of phenomenon, check out Light and Colour in the Outdoors which explains a lot of them with various amateur experiments one can do with e.g. two razor blades or a long tube or whatever to visualise them.