1 / 12

Light Reflection in Surfaces

This lesson delves into the concept of light reflection, discussing angles, absorption, and the effects of surface smoothness. Discover how colors impact light reflection and why objects appear differently based on their surfaces. Explore absorption and heat transfer, with practical examples to deepen your understanding of how light interacts with various materials.

abernathyg
Download Presentation

Light Reflection in Surfaces

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Reflection Getting the Idea S4P1.b

  2. Reflection • Reflection is the bouncing of light off a surface. Light changes direction when it reflects. You can predict the new path if the surface is smooth. The color of an object affects how much light is reflected.

  3. Angle of Reflection • Light always reflects the same way from smooth surfaces. Think about the point where light hits a surface.

  4. Angle of Reflection • A normal is a line straight out from a point on a surface. • The angle of incidence is the angle that light makes when it hits a surface. • The angle of reflection is the angle that light makes when it reflects off a surface.

  5. Angle of Reflection

  6. Angle of Reflection • The angle of reflection always equals the angle of incidence. This is true for smooth and rough surfaces. If the surface is smooth, all the light that hits an object reflects in the same direction. If the surface is rough the light reflects in many directions.

  7. Absorption and Reflection • Some light is always absorbed when it strikes a surface. Objects that have a dark color absorb much of the light that strikes them. Objects that have a light color reflect much of the light that strikes them. Most of the light that strikes a white object is reflected. Most of the light that strikes a black object is absorbed.

  8. Absorption and Heat • Remember that light is a type of energy. When light is absorbed, this energy can change form. It can become heat energy. The picture below shows sunlight striking a white box and a black box.

  9. Smooth and Rough Surfaces • A mirror is a very smooth surface. It reflects most of the light that strikes it. Any light-colored surface can be like a mirror if it is smooth enough. White paper reflects light, but if you look closely you can see that it is somewhat rough. You cannot see yourself in paper because the reflected light scatters.

  10. Discussion Question • You see your reflection if you look into a calm pool of water. Explain why you no longer see your reflection if you shake the water.

  11. Lesson Review • You see yourself in a smooth sheet of aluminum foil. You don’t see yourself in a crumpled sheet of aluminum foil because the light is a. Absorbed b. Attracted c. Magnified d. Scattered

  12. Lesson Review • On a hot, summer day, you may feel warmer if you wear a black shirt rather than a white shirt. This is because light that strikes black objects is mostly a. Absorbed b. Dissolved c. Reflected d. Transmitted

More Related