When the light passes through a raindrop or a prism, the light is refracted (bent).
(the light; passes; through a raindrop or a prism) (the light; is refracted; T:When the light passes through a raindrop or a prism)
the light the light
passes is refracted
through a raindrop or a prism
T:When the light passes through a raindrop or a prism