Answer:

1. When sunlight hits a rain droplet, some of the light is reflected. The electromagnetic spectrum is made of light with many different wavelengths, and each is reflected at a different angle. Thus, spectrum is separated, producing a rainbow.
2. And there is 7 colors of the rainbow

HOPE IT HELPS

how are rainbows made?

A rainbow is caused by sunlight and atmospheric conditions. Light enters a water droplet, slowing down and bending as it goes from air to denser water. The light reflects off the inside of the droplet, separating into its component wavelengths--or colors.

how many colors is there in a raibow?

Seven colours in spectrum: RED, ORANGE, YELLOW, GREEN, BLUE, INDIGO and VIOLET ( ROYGBIV ).