- Analyse why red sunsets can sometimes be more impressive when there is more dust or pollution in the air than usual. Because dust and pollution in the air act as little prisms that cause the light to bend. The different particles scatter and change the light by refracting it.
- 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 behave like tiny prisms in the sky. Sometimes the colour will reach our eyes after it refractes off the prisms. You can also tell the difference between a primary and secondary rainbow by checking the order of the colours. A Primary rainbow is a band in the sky with red at the top and blue at the bottom. A Secondary rainbow is the reverse so the top band is blue and the bottom band is red.
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