1. Tuesday, November 13 th Entry Task Take the next couple of minutes to study for your test You will do the following today: 1.Take the test 2.Turn in the test 3.Get a chapter 18 intro and a 18.1 RSG 4.Work on these, they are due tomorrow Schedule: Chapter 17 Test Objective: I can be assessed on important information about the electromagnetic spectrum Homework Chapter 18 introduction Read/RSG 18.1

2. Wednesday, November 14 th Entry Task Write down the following and then name the term described by each. 1.How a light wave bends when it enters a new medium at an angle 2.How a light wave bounces back when it hits a barrier 3.The type of wave visible light is 4.What mirrors do to light waves to form images Schedule: 18.2 Read 18.2 Notes Packet Homework: Finish note packet Objective: I can understand that lenses for images by refracting light Please have on desk: Work from yesterday will be checked off tomorrow

3. Thursday, November 15 th Entry Task Write down each definition and match it with the correct term. 1.A picture of an object formed by light rays 2.The point where parallel light rays striking a concave mirror meet 3.A surface that curves out like the back of a spoon. Terms: concave, convex, focal point, optics, image Schedule: Mirrors and Lenses Notes Homework 18.2 RSG Objective: I can understand that mirrors for images by reflecting light and that lenses form images by refracting light Please Have on Desk Chapter 18 Introduction 18.1 RSG 18.2 Notes packet

4. Plane Mirrors 1.Look at the shiny side of the foil How clear is the image produced by the mirror (Use a 0-4 scale with 4 being perfectly clear and 0 being no image visible)? Why is this the case. 2. Look at the dull side of the foil How clear is the image produced by the mirror (Use a 0-4 scale with 4 being perfectly clear and 0 being no image visible)? Why is this the case. 3. Lightly crumple the foil and then flatten it again How clear is the image produced by the mirror (Use a 0-4 scale with 4 being perfectly clear and 0 being no image visible)? Why is this the case.

5. Reflection

6. normal angle of incidence angle of reflection 60° Plane Mirrors REGULAR REFLECTION

7. Diffuse Reflection

8. Concave Mirror

9. Convex Mirror

10. Lenses form images by refracting light

11. A medium can refract light Refract: the bending of a wave as it crosses the boundary between two mediums at an angle other than 90 degrees. –Mediums: air  lens  air –Occurs because one side of the light wave reaches the new medium (lens) slightly before the other side does. –That side changes speed, while the other continues at regular speed, causing it to turn.

12. Direction in which a light wave turns depends on whether the new medium slows the wave down or allows it to travel faster. –Denser medium-slow down –Thinner medium-speed up The normal- imaginary line perpendicular to the new surface that helps describe refraction –If the medium slows the wave, the wave will turn toward the normal. –If the medium lets the wave speed up, the wave will turn away from the normal. Refraction of light

13. Refraction and Rainbows Rainbows are cause by refraction and reflection of light through spherical water drops which act as prisms. –Like a prism, water drops separate the wavelengths of sunlight to produce a spectrum. –Unlike a prism, only one color reaches your eye from each drop. Red appears at the top of a rainbow because it is coming from higher drops Violet comes from lower drops

14. Shape determines how lenses form images Flat mediums- produce a clear image on other side A lens is a clear optical tool that refracts light- non flat mediums. –Different lenses refract light in different ways –These different images formed are useful for a variety of purposes Types of lenses: convex and concave

15. Convex Lens Curved outward Parallel light rays passing through a convex lens are refracted inward. –They meet at a focal point on the other side of the lens –Rays refract twice: when entering the new medium and when leaving the new medium. –Rays on the outer part of the lens are refracted the most –Rays on the principal axis-the line joining the center of the two curved lenses- will go straight through and not refract. principal axis focal point

16. Concave Lens The lens is curved inward. Parallel light rays that pass through a concave lens are refracted outward. –Rays do not ever meet. –Rays refract twice: when entering the new medium and when leaving the new medium. –Rays on the outer part of the lens are refracted the most –Rays on the principal axis-the line joining the center of the two curved lenses- will go straight through and not refract. Principle Axis

17. Images formed by lenses Type of image depends on –Lens type –For convex lenses: the distance between the lens and the object. Convex lens: Distance from lens is measured in focal length- the distance from the center of the lens to the lens’s focal point.

18. How Convex Lenses Form Images Look at the 3 steps below to see how an image is formed by a convex lens. Step 1 is repeated from the previous slide.

19. Convex Lenses Bigger? Smaller? Flip-Flop? If the object is more than two focal lengths away, the image will be upside down and smaller. If the object is between 1 and 2 focal lengths away the image will be upside down and larger. If an object is less than one focal length away it will appear right side up and larger.

20. Concave Lenses Always right side up and smaller than normal appearance. Distance between lens and object does not make a difference.

21. Friday, November 16 th Entry Task Do the following using your own words 1.Define Focal Point 2.Define Focal Length 3.Define Lens Schedule: Looking at Mirrors and Lenses Lab Objective: I can understand that lenses form images by refracting light Homework Read/RSG 18.3 Please have on desk: 18.2 RSG