Explain how a secondary rainbow is formed. What will be an ...

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Explain how a secondary rainbow is formed.
 
  What will be an ideal response?

Question 2

Platelike crystals between a low Sun and an observer can also ________ sunlight off their tops and bottoms to produce ________.
 
  Fill in the blank(s) with the appropriate word(s).

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Answer to Question 1

Answer: Secondary rainbows require two reflections within the raindrop. A small portion of the light hitting the back of the raindrop is reflected back from the interior of the droplet surface, penetrates the droplet once again, and is refracted a second time as it exits the front side of the droplet at a position somewhat lower than where it entered the droplet.

Answer to Question 2

Answer: reflect; sun pillars