Study Guide Day!

Today is your day to work on your study guide. It is unit 3 for conceptual and unit 2 for honors. Below you find pictures of the back of the study guide and the abridged answers. Test tomorrow!

Conceptual: Reflection and Refraction Practice

The was no bellwork today so that you could have as much time as possible to work on missing assignments or Reflection and Refraction Practice. This is a lot like your test (which is next Tuesday) and is due tomorrow.

Honors: Reflection and Refraction Practice

First, a little more about the eye and how nearsighted and farsighted vision works.

The rest of the day was yours to work on Reflection and Refraction Practice. Make sure you got the Honors version. This is due tomorrow.

Conceptual: The Eye

No homework tonight!

Honors: Lens Ray Diagrams I

Today we started drawing lens ray diagrams. We will finish these tomorrow. Homework tonight is Concept-Development 29-4. This is NOT the same Concept-Development 29-4 that the regular classes already had. Make sure you get the right one.

Conceptual: Lens Ray Diagrams II

Today we finished learning how to draw lens ray diagrams! Homework is Concept-Development 30-2.

Conceptual: Lens Ray Diagrams I

Today we started drawing lens ray diagrams. We will finish these on Monday. No homework tonight!

Honors: Lenses

Due to the pep assembly today, we were missing about half of the students. Therefore we did not have bellwork. We had time to work on yesterday's lab and fill in these notes about lenses:

No homework this weekend. Bring a ruler and three different colors of writing utensils on Monday.

Honors: Finding Index of Refraction of Acrylic

First we did a bellwork to make last night's homework a little more clear:

Then we looked at a couple of demonstrations of total internal reflection. I took some (bad) video of one demo; the video is here.

Finally, we worked on Refraction Lab: Index of Refraction of Acrylic. Keep in mind there was a rectangle on the front where you took your data that does not show up in this link. This lab is due tomorrow.

Conceptual: Lenses

First we used bellwork to make last night's homework a little more clear.







Then we used our light sources and some small plastic lenses to discover how convex and concave lenses affect light.

No homework tonight!

Conceptual: Total Internal Reflection

Bellwork and notes below. We also saw a demonstration of total internal reflection in a stream of water. I tried to take video of it...though I did not do a great job. The video is here. Homework tonight is Concept-Development 29-4.

Honors: Snell's Law and Total Internal Reflection

Homework is Total Internal Reflection. Tomorrow we will complete a short lab using Snell's Law.

Refraction

Homework tonight is Concept-Development 29-3.

Lens Lab: Real Images - Part 1

Today we are starting a lab, but we won't get all that far. First, some bellwork, during which we found out that the place where an image forms behind a convex lens is the focal point IF the light coming into the lens is parallel. The light will be parallel if the source is very far away.



So we took some lenses, looked at a distance source of light (outside), and measured the focal length for our lab. We will continue this tomorrow; please fill out the values of d_o based on the focal length of your lens.

Lens Lab: Real Images

Day two of the candle lab! First some bellwork:



Then we turned off the lights, lit some candles, and took some data! Your lab sheet is due tomorrow.

Total Internal Reflection

First we did some bellwork to help you on this weekend's homework:


Then we talked briefly about total internal reflection and demonstrated it with a tank of water and a laser. Here are some notes:

Total Internal Reflection

Homework tonight, due Monday: Concept Development 29-3
\

Honors students: Here is a reading to look over this weekend. I'll have homework on this subject for you next week.

Refraction

The bellwork and notes kind of merged today. In between, we went outside and pretended to be a light ray to show how refraction happens.

Here are some old notes from a couple of years ago:
Refraction

Honors students: your homework is Concept-Development 29-4, due on Monday
.

Refraction Final Review Bellwork

Wednesday, 2/18: Test 2

The second test this semester covers light, reflection, and refraction.

After your test, you received Concept-Development 30-2. Please finish the front by Friday. The whole thing will be due on Monday.

Thursday, 2/12 and Friday, 2/13: Test 2 Review

Today and tomorrow are your days to review for your test next Wednesday. The test will cover light, reflection, and refraction. The review questions are below.

We also counted teacher stamps today.

Semester 2 Test 2 Review
The test is on Wednesday, February 18, 2009.
In addition to the questions below, you need to be able to list the entire electromagnetic spectrum in order and to tell me who can see whom in a mirror.

p.419-420
8. How do the frequencies of infrared, visible, and ultraviolet light compare?

18. Distinguish between an umbra and a penumbra.

20. What is the difference between light that is polarized and light that is not?

24. What evidence can you cite to support the idea that light can travel through a vacuum?

p. 439
2. Are black and white real colors, in the sense that red and green are? Explain.

p. 460-462
4. What is meant by the normal to a surface?

5. What is the law of reflection?

6. When you view your image in a plane mirror, how far behind the mirror is your image compared with your distance from the mirror?

12. Distinguish between reflection and refraction.

13. When a wave crosses a surface at an angle from one medium into another, why does it “pivot” as it moves across the medium into the new medium?

28. Suppose that a mirror and three lettered cards are set up as in the figure. If a person’s eye is at point P, which of the lettered cards will be seen reflected in the mirror? Explain.

30. Trucks often have signs on their backs that say, “If you can’t see my mirrors, I can’t see you.” Explain the physics here.

35. If you were spearing a fish with a spear, would you aim above, below, or directly at the observed fish to make a direct hit? Would your answer be the same if you used laser light to “spear” the fish? Defend your answers.

39. Suppose you walk toward a mirror at 1 m/s. How fast do you and your image approach each other? (The answer is not 1 m/s.)