Lenses can be used to help people see clearly.
Fig. 18.1 is a diagram of a convex lens.
Fig. 18.1
Fig. 18.2
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Use the model in Fig. 18.2 to help you.
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Fig. 18.3 is a diagram of her experiment.
Fig. 18.3
She looks at red paper with red light. The paper appears red.
What colour does the red paper appear in blue light?
Explain your answer.
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