Before revision: Dewbow on the ground Dewbow on a spiderweb A dewbow is an optical effect , similar to a rainbow where the dewdrops reflect and disperse sunlight, producing all the colours in the visible spectrum .
After revision: Dewbow and heiligenschein on a horizontal field of grass Dewbow on a spider web A dewbow is an optical effect caused when dewdrops reflect and disperse sunlight, displaying all the colours oflike a rainbow the visible spectrum .