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The Ray Model of Light

Learn about light properties, classification of matter, image reproduction, mirror reflection, and laws of reflection in this informative guide. Discover how light rays and mirrors interact, and differentiate between clear and diffuse reflection. Engage in hands-on activities and understand the concepts through practical examples.

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The Ray Model of Light

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  1. The Ray Model of Light

  2. Laser Part 1 – Properties of Light • Light travels in straight lines:

  3. Light travels VERY FAST – around 300,000 kilometres per second. At this speed it can go around the world 8 times in one second.

  4. A luminous object like a candle radiates light in all directions • We can use a light ray, which is a line and arrow showing the direction light is travelling, to show this.

  5. Using Light rays to show the path of light striking an object is called Geometric Optics • When light emitted from a source (the Sun) strikes an object (Earth), it is called Incident Light

  6. 3 Classifications of Matter • Recall: • A transparent object lets light pass through it easily

  7. 3 Classifications of Matter • Recall: • A translucent object allows some light to pass through

  8. 3 Classifications of Matter • Recall: • An opaque material does not let any light pass through it

  9. An image is a reproduction of an original object that is produced through the use of light • A mirror is any polished • surface that exhibits • reflection • Reflection is simply the • bouncing back of light • from any surface

  10. Part 2 - Reflection Normal • Reflection from a mirror: Reflected ray Incident ray Angle of reflection Angle of incidence Mirror

  11. Activity • In your lab groups, try Activity 11.5 on Page 482 and 483

  12. Angle of incidence = Angle of reflection • The Law of Reflection In other words, light gets reflected from a surface at ____ _____ angle it hits it. The same !!!

  13. Clear vs. Diffuse Reflection • Smooth, shiny surfaces have a clear reflection: Rough, dull surfaces have a diffuse reflection. Diffuse reflection is when light is scattered in different directions

  14. Specular Reflection • Specular reflection is the reflection of light off a smooth surface • Disco rules! • The water acts like a plane mirror

  15. Using mirrors • Two examples: 2) A car headlight 1) A periscope

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