Mon 14 Apr

Monday Apr 14th:

Key Concept(s) Today: Lenses

Journal: What happens to ice on a bridge when you put NaCl on it? Explain

L#69: 1- 3, 6, 10, 16, 18 (Due Monday) (Lenses)

Lenses:

http://dev.physicslab.org/Document.aspx?doctype=3&filename=GeometricOptics_ConvergingLenses.xml

Lenses: Location of image

NF: Near Focus (side near eye/opposite side from object)
FF: Far Focus (side opposite of eye/same side as object)

Draw: Concave/Converging Lens:

diagram

1. Pà NF

2. FFà P

3. May use centerline (from top of object through dead center of lense) à top of image will also be on centerline)

Draw: Convex/Diverging Lens:

1. Pà FF

2. NFà P

3. May use centerline (from top of object through center à top of image will also be on centerline)

L#70: 1- 4, 7, 8, 10, 11, 18, 20 (due Friday 17th) (Static/Induced Charges)

Bridge Building: Friday

#71: 1- 4, 6 - 8, 10, 13 - 17

(due Wed/Thurs 20/21 Apr) (Pendulum)

Lab: Friday

Key Concept(s) Today: Temp & Heat, Review (W/S)

L#69: 1- 3, 6, 10, 16, 18 (due Today) (Lenses)

Lenses:

Demo:

http://webphysics.davidson.edu/Course_Material/Py230L/optics/lenses.htm

1. An 1.0m object is placed 2.5 meters from a converging lens (f = 1.0m). Find

a. location

b. orientation

c. distance from lens

d. size of image

e. magnification of image.

diagram

Answers: a. Real (same side as eye)

b. Up-side-down/inverted

c. about 2.0 m

d. about .75 m

e. M=H_i/H_o

_{.75/1.0 = .75 of 3/4}

2. Davin (4.0m tall) is placed 8.0 meter from a diverging lens (f = 3.0m). Find

a. location

b. orientation

c. distance from lens

d. size of image

e. magnification of image.

Answers: a. Virtual (opposite side as eye)

b. Upright

c. about 2.0m

d. about 2.0m

e. M=H_i/H_o

_{2.0/4.0 = 0.5}

Davin’s image is Virtual, Upright, and Shorter than the real Davin.

Some would say that Davin’s image

looks better than Davin himself.

L#70: 1- 4, 7, 8, 11, 18, 20 (due Monday 14th) (Static/Induced Charges)

Lab: Tues 15th / Wed 16th Don't give me any Static

#71: 1- 4, 6 - 8, 13 - 17

(due Thurs/Fri 17/18th) (Pendulum)

Monday (21^st): Tower Contest

L#74: 1- 2, 7, 10, 13, 15, 16, 18, 20

(due Tuesday 22th) (2nd law of Thermodynamics)

L#78: 1- 2, 8, 11, 12, 14, 15 -19

(due Friday 25th) (Standing Waves)

L#70: 1- 4, 10, 7, 8, 11, 18, 20 (due Today 14th) (Static/Induced Charges)