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Britannica offers thousands of up-to-date, curated, and curriculum-relevant articles, images, videos, audio clips, primary sources, maps, research tools, recommended Web sites, and three separate encyclopedias.
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Optics
- Optics - BritannicaOptics is the study of light. Optics describes how light is created and how it travels. An important part of optics is the study of what happens when light hits different surfaces. When light hits a surface, it may be reflected, refracted, or absorbed.
- Light - BritannicaPeople and other animals can see because there is light. Light is a form of energy. The Sun is a very important source of light energy. Without the energy from the Sun, there would be no plants or animals on Earth’s surface.
Transfer of Light
Light illuminates the world around us. Thanks to it we can see things. But what is light composed of? Where does it come from?
In this video, we will learn how light is propagated and its relation to energy, as well as the main natural and artificial light sources. We will also discuss the reflection and refraction of light, and how these phenomena explain the composition of light and the colours we see.
This video explores various sources of light, including natural and artificial. Students will learn about these two types of light sources and examples for each, as well as how some light sources can produce heat.
If there wasn’t any light, we wouldn’t be able to see! Can your students imagine a world like that? Begin investigating the concept of light with your students with this fantastic new Miniclip. Engaging examples provide your students with a real-world understanding of how light allows us to see and the difference between natural and artificial light sources. Open your students’ eyes to the amazing nature of light!
Points of interest
Fact 1: Colours are caused by visible light reflecting
Fact 2: Light travels really fast
Fact 3: Some animals produce their own light
Fact 4: Types of lights we cannot see.
Fact 5: Plants create food from sunlight.
Educational video for childrem to learn about light. Light comes from light sources that can be natural or artificial. An example of a natural light source is the sun and an example of an artificial light source is a lighthouse. There are materials that behave differently with light: transparent, translucent and opaque. Transparent materials allow light to pass through them. Translucent materials are those that allow some light to pass through. Opaque materials are those that don't allow any light to pass through.