1. Reflection, Absorption, and Refraction of Light

2. When Light Strikes an Object
Light travels in a straight line.
It will continue moving in a straight line, until it hit something.
Depending on what it hits, light may behave in very different ways.
Transmission of Light

3. Reflection When light bounces off a surface, it is called reflection.
When light is reflected it travels in a straight line away from the reflecting surface.
Example of Reflection:

4. Absorption
Any time light hits a surface, some of it is absorbed, or taken in.
When light is absorbed into a surface it is transformed from light energy, into heat energy.
That is why on a sunny day it is cooler to wear a white t-shirt, than a black t-shirt; dark surfaces absorb more light than lighter surfaces.

5. Refraction
Some materials transmit light, or allow light to pass through them.
These transparent materials cause light to bend as it is passing through the surface.
When the light bends, it makes things look like they do not match up.

6. Properties of Light What happens to the light depends on the material
Transparent (clear) materials- transmit light
Translucent (see through) materials- scatters the transmitted light
Opaque (not see through) materials- absorbs and reflects

7. Properties of Light Color of objects is the color it reflects
Ex- an orange is orange because it absorbs every color BUT orange, instead it reflects orange

8. Properties of Light Color of objects is the color it reflects
Ex- an orange is orange because it absorbs every color BUT orange, instead it reflects orange
If you do not shine orange light on it, it will appear black
Black is the absence of color, white is the blending of all colors

9. Properties of Light
Reflection- when an object or wave bounces back off a surface
Law of reflection- angle made from incoming wave = the angle made from reflected wave

10. Properties of Light
Refraction- bending of light waves due to a change in speed
Lens- curved glass or transparent material that refracts light
Convex lens- thicker in the center than the edges (bends light in)
Concave lens- thinner in the center than the edges (bends light out)

11. Convex vs. Concave