Make your own rainbow. On a sunny afternoon or morning, turn on the water sprinkler to create a spray of water drops. Stand as close to the spray as possible (without getting soaked) and observe that, as you move up, down, and sideways, the bow moves with you.
(a) Explain why this happens.
(b) Also, explain with the use of a diagram why the sun must be at your back in order to see the bow.
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