Rainbow Disk imaged
near sunset by Adrian Czerniak in southern Ontario, Canada on 8th June
©Adrian Czerniak, shown with permission.
Rainbows are not bows, they are disks, albeit
brightening towards the edge.
is made by sun rays reflected
once inside raindrops. Each drop deflects
and spreads the rays into a range of angles. Those rays that enter
our eye are seen as a glint, like the flash of a jewel. The glints
from all the individual raindrops form a disk in
The disk takes
the sun's colour because the coloured raindrop glints
overlap and merge. Other than at sunset it looks like brighter sky.
Only at the disk edge do we see colours because
the red disk is largest followed in size by those of yellow, green
on rainbows Gallery