This is my first time to take photos of rainbow, and even double rainbows! Originally I would just stay at Tai Tam and wait to take night shots of the dam. But suddenly rain came, I did not get off the bus and went to Stanley. Surprisingly, something appeared in the sky…wow!
Secondary rainbows are caused by a double reflection of sunlight inside the raindrops, and appear at an angle of 50–53°. As a result of the second reflection, the colours of a secondary rainbow are inverted compared to the primary bow, with blue on the outside and red on the inside. The secondary rainbow is fainter than the primary because more light escapes from two reflections compared to one and because the rainbow itself is spread over a greater area of the sky. The dark area of unlit sky lying between the primary and secondary bows is called Alexander’s band.