- Analyse why red sunsets can sometimes be more impressive when there is more dust or pollution in the air than usual.
Blue light is scattered more than other particles into the atmosphere which alters the direction of the light rays. When viewed against the dark background of space, the sky then appears blue. At sunset and sunrise the sunlight travels further and only the red and orange reaches us,
- Describe what happens inside water droplets to cause a rainbow and explain how you can tell whether a rainbow is a primary or secondary.
Small droplets of water act as a prism and refract the light that goes inside. Droplets higher in the sky refract red whereas lower skies refract blue. Green will bend lower down causing a rainbow effect. Primary rainbows start with red at the top and secondary rainbows start with red at the bottom.
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