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Properties of Light
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Transcript
Properties of Light
- Light is a type of energy known as electromagnetic radiation.
- Energy is carried in small particles called photons
What is light?
What we will discuss today:
How does light travel?
- Light travels as a wave
- Light does not need matter to travel along
1. What is light?
2. How does light travel?
3. What are shadows?
4. When light hits a surface, its energy can be absorbed, reflected, or deflected by refraction.
Reflection
What are shadows?
Light travels in a straight line
Shadows on a football field
*Demo
Refraction
- Definition: dark areas or shapes made by an object blocking rays of light
- What property of light is responsible for the creation of shadows? Let's investigate!
- Light rays reflect (bounce) off objects.
- Smooth surfaces, such as mirrors, reflect light in one direction.
- the angle at which the wave approaches a flat reflecting surface is equal to the angle at which the wave leaves the surface
Light is absorbed
There are three ways in which light waves
hit a surface:
It’s energy can be:
1. absorbed (soaked up)
2. reflected
3. deflected by refraction
When light enters a new medium the light rays are slowed down and deflected. This directional change of light is called refraction.
- Opaque materials absorb light photons.
- Energy is converted to heat
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