This lesson has been written for GCSE students and aims to ensure that they can explain in detail why light changes direction due to refraction. The key to the explanation is the use of the correct terms in context so the start of the lesson challenges the students to come up with the key words of light, bend, normal, density and speed when given a range of clues. The next part of the lesson works with the students to bring these key terms together to form a definition of refraction. Moving forwards, the relationship between density of a medium and the speed of light through that medium is discussed so that there is a clear understanding of why light bends one way or the other. The next task uses the definition to apply to a practical situation to draw a diagram of light moving from air to glass. The final part of the lesson involves a range of practicals so this topic can be explored further.
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