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1. The Physics of Light by Mr. Schneider, Rm 24Hey kids, do you see the light? Why? How?
2. What Is Light? In this Powerpoint presentation:
Properties of light
Colors
Reflection - Mirrors
Refraction - Lenses
3. Properties of Light Light travels in straight lines:
4. Light travels much faster than sound. For example:
5. Light travels VERY FAST – about 300,000 kilometers per second or 186,000 miles per second.
6. Light can create shadows
7. Light travels in waves A wave is a disturbance that transfers energy from place to place.
8. What characteristics do light waves have? Light waves are like other kinds of waves. They have crests, troughs, wavelength, frequency and speed. However, light waves are electromagnetic! Light waves have a component that is electric and magnetic!!
9. 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!!
10. Light is a form of energy calledElectromagnetic Radiation -Electromagnetic Radiation comes from the sun and other sources
11. Electromagnetic Radiation Travels at the speed of light
Is mostly invisible
Carries energy
Is VERY important to society and is something YOU can’t be without for many reasons
12. Types of electromagnetic radiation Radio and TV - Great for broadcasting
Microwave-Super for cell phones, microwaves
Infrared-Think HEAT
Visible Light - Yep, it’s how we see
Ultraviolet - Invisible, can cause cancer; kills germs
Xray- images of bones and teeth; space exploration
Gamma - treating cancer (radiation therapy)
13. Properties of Light summary Light travels in straight lines and is a form of energy
Light travels much faster (a million times faster!) than sound
We see things because they reflect light into our eyes
Shadows are formed when light is blocked by an object
Visible light is only a small part of the electromagnetic spectrum; the other parts are invisible to the human eye but not necessarily the eyes of other animals.
14. Part 2 - Reflection and Mirrors
15. Regular vs. Diffuse Reflection Smooth, shiny surfaces have a regular reflection:
16. Using mirrors Two examples:
20. Review of Reflection
21. Refraction
26. Review of Refraction
27. Color Part 3 - Color In this section of the Powerpoint you will learn about color and how we can mix colors to create other colors. We will also learn how light helps us to see various colors around us.
28. Yes, we LOVE color!
29. Color White light is not a single color; it is made up of a mixture of the seven colors of the rainbow.
30. The colors of the rainbow: Red
Orange
Yellow
Green
Blue
Indigo
Violet
31. Adding colors of light White light can be split up to make separate colors. These colors can be added together again.
The primary colors of light are red, blue and green:
32. Seeing color The color an object appears depends on the colors of light it reflects.
33. In different colors of light this shirt would look different:
35. Using filters Filters can be used to “block” out different colours of light:
36. Some further examples:
37. Investigating filters
39. Part 2 - Reflection and Mirrors Reflection from a mirror:
40. The Law of Reflection
41. Brain Pop Movie on Color