Question

What causes rainbows?

Answer 1

Urgent!!

Answer 2

انكسار الضوء الابيض ينتج عنه الوان الطيف السبعة وهو قوس قزح

Answer 3

refraction

Answer 4

Rainbow is caused by light being refracted while entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it. and in this way it produces colours

Answer 5

In a rainbow, raindrops in the air act as tiny prisms. Light enters the raindrop, reflects off of the side of the drop and exits. In the process, it is broken into a spectrum(band of colours) just like it is in a triangular glass prism.

Answer 6

http://en.wikipedia.org/wiki/Rainbow#Explanation

Answer 7

Here's a great lecture on the topic:
http://ocw.mit.edu/courses/physics/8-02-electricity-and-magnetism-spring-2002/video-lectures/lecture-31-rainbows/