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Understanding Light Reflection Through Ray Diagrams in SNC2D

In this lesson on ray diagrams, we explore how light interacts with different objects, leading to the formation of shadows and reflections. Ray diagrams illustrate the path light takes away from its source, using straight lines and directional arrows. We discuss the properties of transparent, translucent, and opaque objects and how they affect light transmission. By examining the nature of shadows—umbra and penumbra—and types of reflection—regular and diffuse—we gain a deeper understanding of why objects appear bright or dim and how light behaves in various contexts.

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Understanding Light Reflection Through Ray Diagrams in SNC2D

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Presentation Transcript

  1. Light and Matter Intro to Ray Diagrams SNC2D Now that we know that every object that we see is due to the light bouncing off of it…our new learning is goal is to understand HOW exactly the light reflects off of different types of objects

  2. Ray Diagrams • Ray diagrams are drawings that show the path that light takes after it leaves its source. • Straight lines are used to represent rays of light. Arrows are included at the end of the line to indicate the direction of the light ray • These diagrams are used to explain why we see shadows and reflections

  3. Why Do Certain Things Look Brighter Than Others? • The more light rays that can reach your eye, the brighter the object will seem!

  4. How Does Light Reflect? • Transparent Objects – let light pass through (transmit) freely. They hardly absorb or reflect any light. • Translucent Objects – transmit some light but not enough to see through a material clearly. • Opaque Objects – absorb and reflect light, but they do not transmit

  5. Which Object is Which? Translucent!

  6. Which Object is Which? Opaque!

  7. Which Object is Which? Transparent!

  8. Which Object is Which? Transparent, Translucent and Opaque!

  9. Here’s What It Looks Like…

  10. Shadows • A shadow occurs when an opaque object blocks the direct light from a light source. • A ray diagram illustrates how the size of a shadow depends on the size of the object blocking the light and its distance from the light source

  11. Shadows

  12. Shadows • Umbra – part of shadow in which all light rays from the light source are blocked • Penumbra – area of partial shadow on either side of the umbra usually due to a very large light source compared to a smaller object

  13. Light Reflection • Regular reflectionhappens when light rays strike a smooth surface and reflect in the same direction, staying parallel to one another.

  14. Light Reflection • Diffuse reflection occurs when light rays reflect off a rough or uneven surface, scattering the light in different directions. You do not see an image when this occurs.

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