and dear vahed, i meant why doesnt the light of moon do the same thing?
have a nice time
Dear Cris,
as i toled you, because The moon hasn't any real light!
The light that we see in nights from the moon is just the repercussion of Sun's real beam,
because the moon is near us so we can see light rayofIt's surface,
but in day the proximate light ray of sun by strike to the water drops disintegrate to 7 colors.
and also you can find your answer by another question:
Why the sky of Day is blue but the sky of night is black?
by this sample question you can find out that there is a big difference between sun light and the moon light!
i hope my answer to be useful for you.
thanks dear