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Refraction

Explore how light changes direction when entering transparent media, conduct a practical experiment, and explain the concepts of incident ray, refracted ray, and normal. Safety measures and demonstration are included. Enhance understanding and draw conclusions from investigations.

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Refraction

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  1. Refraction 23 October, 2019 Keywords Incident ray, Refracted ray, normal, transmission, medium, media, transparent

  2. All students should be able to: Be able to carry out a practical to show that light changes direction when it enters different transparent media. Most students should be able to: Describe that light changes direction when it enters different transparent media at an angle. Some students should be able to: Explain why light changes direction when it enters different transparent media at an angle. Outcomes

  3. We will answer this at the end. Starter: Why should a non-swimmer be careful about jumping into a pool of water that looks shallow?

  4. youtube video questions Refraction

  5. How is light refracted? Your teacher will demonstrate the refraction practical to you. Draw a table and write a conclusion from your investigation. SAFETY: Light bulbs will be HOT and make ray boxes hot. Wait for them to cool down before tidying away. Practical Time

  6. When light enters a different transparent medium it will change direction. It bends towards the normal when travelling into a denser medium. normal Refraction – check your diagram:

  7. n n the image of the fish the fish! Where’s the Fish?

  8. Draw a diagram and write an explanation in your book. Your diagram should include all labels and a description of how the light refracts. Plenary: Q: Why should a non-swimmer be careful about jumping into a pool of water that looks shallow?

  9. WWW Have they drawn a diagram? Does it show rays of light with arrows – are they travelling the right way? Does it include the following keywords? Incident ray, Refracted ray, normal, transmission, medium, media, transparent EBI: what could they have improved? WWW/EBI

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