1. Agenda for 3/31/17 Grade EMS Review sheet
Refraction & Diffraction Notes
Test next week!
HW – None

2. I can explain the difference between reflection and refraction.
I can explain what a diffraction grating does.

3. Refraction of Light
Placing a spoon into a cup of water causes the spoon to look distorted or shifted.
Placing a pencil into a beaker of water causes distortion because of refraction
Definition:
the bending of waves caused by a change in their speed when they move from one medium to another.
Diagram:

4. Refraction of Light
Using a prism, you produce a spectrum. How do you know?
Why does white light turn into the colors of the rainbow?
Prism refracts the light twice. When it enters and when it exits.
Can see colors of the rainbow.

5. Refraction of Light How are rainbows formed?
Water acts like a prism and refracts white light (Sun)

6. How to catch Nemo

7. Diffraction of Light Definition:
The bending of waves around a barrier.
Diagram:

8. Diffraction in Water

9. Diffraction of Light
What is a diffraction grating and what does it do?
Piece of glass or plastic made up of many parallel slits. Different wavelengths allow certain colors through.

10. Agenda for 4/3/17 Notes on Lenses Waves Properties of Light Worksheet
HW – Light Behavior
Test Friday!

11. When you leave today… I can explain what a lens is.
I can describe what the image looks like with concave and convex lenses.

12. Lenses
Definition:
curved piece of clear material that refracts light.

13. Two Types of Lenses Convex Concave
Convex Lenses.
Definition: curves out, lens is thicker in middle than on outside.
Concave Lenses.
Definition: curves in, lens is thinner in middle than on outside.

14. Write down what you see
Convex Lens
Concave Lens

15. Convex Lenses Diagram:
Used to correct far-sightedness (inability to focus on objects up close).

16. Concave Lenses
Used to correct near-sightedness (inability to focus on objects far away).

17. Focal Point and Focal Length
the point that all parallel light rays pass through a convex lens.
Focal Length:
the distance from center of the convex lens to its focal point.

18. Wave Properties of Light
incident equal reflection incidence reflected normal reflection
When a wave strikes an object and bounces off, ___________________ occurs. Waves that strike an object are called _______________________ waves. Waves that bounce off are called ______________________ waves. A perpendicular line drawn from where the incident wave strikes is called the __________________. The angle between the incident wave and the normal is the angle of __________________. The angle between a reflected wave and a normal is the angle of __________________. in reflection, the angles will be ________________.

19. Wave Properties of Light
interference light diffraction
slits dark colors
diffraction grating
The bending of light around corners is _______________________.
Diffraction results in light and ______________________ areas on
the edge of a shadow. Light or sound
waves can meet, causing _____________________. If light is
passed through narrow _____________________, the light
waves will interfere, forming dark and
__________________ bands. When white light is passed through ____________, white light is separated into _______________________.

20. Agenda for 3/26/15 Go over Light Behavior worksheet
Refraction of Light Lab
HW – Waves and Light Study Guide

21. Light Behavior WS
How is reflection of light different from refraction of light?
Answer  reflection of light bounces off objects and refraction of light travels through objects.
What happens to light when it goes through a prism? Explain why.
Answer  develops color of the spectrum. Light is refracted twice.
A __________________ contains many parallel slits that can separate white light into colors.
Answer  diffraction grating
Why does an object appear to be black in color?
Answer  all of the colors wavelengths are absorbed.
Describe why the color of our desk is tan.
Answer  tan is reflected and all of the other colors are absorbed.

22. Light Behavior WS
What are the most dangerous waves in the electromagnetic spectrum?
Answer  gamma rays
What colors make up the visible spectrum?
Answer  ROYGBIV
How is diffraction different from refraction?
Answer  Diffraction – lights bends around object Refraction – lights travels through object.
Which type of lens would be used by people who are near-sighted (can’t see far away)?
Answer  Concave Lenses
Which type of lens would be used by people who are far-sighted (can’t see close)?
Answer  Convex Lenses

23. Agenda for 3/22/16 Refraction of Light Lab
Finish Waves and Light Study Guide
Waves and Light Quiz tomorrow
Unit 6 Exam next week