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Interacting with light

Explore the behavior of light with ray diagrams and shadows. Learn how light interacts with different materials and forms shadows. Understand regular and diffuse reflection properties.

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Interacting with light

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  1. Does a Plane Mirror Reverse Left and Right? Interacting with light

  2. The Ray Model of Light

  3. Ray Model of Light – light is represented as straight lines called rays, which show the direction that light travels. • Ray Diagrams – drawings that show the path that light takes after it leaves its source. • Each ray ends with an arrow to indicate the direction of travel. • Ray Diagrams can help explain why the brightness of a light changes with distance. Light and Matter

  4. Ray Diagram Light and Matter

  5. Transparent • Clear glass or clear plastic • Transmit light freely. • Materials absorb and reflect very little light, that is why you can see clearly through a window pane. Light and Matter

  6. Translucent • Materials transmit some light, but not enough to see through the material clearly. • Some light can pass through, but you cannot see what is on the other side of the frosted glass. • Frosted window pane. Light and Matter

  7. Opaque • Object absorb and reflect light, but they do not transmit it. Light and Matter

  8. Shadows • A shadow occurs when an opaque object blocks the direct light from a light source. • A small light source casts shadows that are sharp and well defined. • If the light source is large compared to the object blocking the light, then the shadow will not have a sharp edge, because the object only partly blocks the light. • The wider the light source the more blurred the shadows will be. Light and Matter

  9. Shadows • Umbra – part of the shadow in which all light rays from the light source are blocked. • Penumbra – the area of partial shadow from a non-point light source. Light and Matter

  10. Light Reflection • Regular Reflection • Light rays that strike a smooth surface and reflect in the same direction, staying parallel to one another. • All the rays are reflected at the same angle. • When they reach your eyes they are almost the same as before they were reflected. • When regular reflection occurs it is possible to see an image in the reflection. Light and Matter

  11. Regular Reflection Light and matter

  12. Light Reflection • Diffuse Reflection • When light rays reflect off a rough or uneven surface, they do not remain parallel but are scattered in different directions. Light and Matter

  13. Diffuse Reflection Light and Matter

  14. Light and Matter

  15. Some Properties of Light Lab Light and matter

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