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Waves and Radiation

Learn about how light travels, reflection, lenses, and practical applications in this informative lesson series. Explore the properties of visible light and discover the law of reflection through hands-on experiments.

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Waves and Radiation

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  1. Waves and Radiation Light

  2. Learning Outcomes • Light travels in straight lines. • Reflection of light. • Convex and concave lenses. • Applications of light.

  3. Lesson 1 • Learn how to draw a normal. 2. Prove the law of reflection.

  4. Light Visible light is part of the electromagnetic spectrum. It only travels in straight lines.

  5. Reflection Why does the moon “glow”, when it is simply a piece of rock? When you see objects, it is because light is being reflected off of the surfaces of that object. The moon glows because it reflects light from the sun.

  6. Drawing a Normal Copy! A normal is a line drawn at right angles to a surface. All angles that are used in studying light are taken “from the normal”. x Ray of light 1. Where does the light strike the surface? 2. At this point, draw a dotted line at right angles to the surface.

  7. Experiment Aim To study the reflection of light.

  8. Plane Mirror Angle of Incidence i r Method Sheet of Paper Ray box with single slit Angle of Reflection Normal line • Draw a straight line along which the ray of light will travel. 2. Draw in the normal. 3. Measure the angle of incidence, i. 4. Switch on the ray box. 5. Measure the angle of reflection, r. 6. Repeat for different angles of incidence.

  9. Results

  10. Copy! When light is reflected, the angle of incidence is equal to the angle of reflection. Conclusion – The Law of Reflection Plane Mirror Angle of Incidence i r Angle of Reflection Normal line

  11. 2002

  12. 2006

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