1. Light & Matter
Kate albarracin
Reflection & Reflection & Light

2. Reflection Refraction Light bounces off of objects
Light bends in objects

3. Sorting Reflection Refraction Mirror Shiny Screen Key Eyeglasses Prism
Rainbow
Magnifying glass
Pond Water
straight

4. Light travels VERY FAST – about 300,000 kilometers per second or 186,000 miles per second.
At this speed light could travel the equivalent of 8 times around the world in one second!

5. Light travels in _______ lines:
Properties of Light
Light travels in _______ lines:
Straight
Laser

6. Light hitting at an
angle is bent
Light hitting
straight on is
not bent

7. Refraction A medium is something that light travels through!
Light rays are slowed down by the water
The amount that light bends when it enters a new medium is called the “index of refraction”
Refraction is when light speeds up or slows down due to travelling in a different medium
Causes the ruler to look bent at the surface
The mediums in this example are water and air

8. Straw Demo

9. Regular vs. Diffuse Reflection
Smooth, shiny surfaces have a regular reflection:
Rough, dull surfaces have a diffuse reflection.
Diffuse reflection is when light is scattered in different directions

10. Part 2 - Reflection and Mirrors
Reflection from a mirror:
Normal
Incident ray
Reflected ray
Angle of incidence
Angle of reflection
Mirror

11. Angle of incidence = Angle of reflection
The Law of Reflection
Angle of incidence = Angle of reflection
In other words, light gets reflected from a surface at ____ _____ angle it hits it.
The same !!!

12. We see things because they reflect light into our eyes
We see things because they reflect light into our eyes! This is literally the only way we get to see things! ALL objects we see either create light or reflect light!!
Homework