1. Monday(02/08): Review Physics for FCAT and Standardized Tests.

HW: Begin reading of Chapter 19.

2. Tuesday(02/09): Ch.19 - Interference and Diffraction of Light.

HW: Read and Study pages 515-23, then solve problems 47, 48, and

49 on pages 536-37.

3. Wednesday(02/10): Thin Films, and Resolving Power. HW: Read

and Study pages 524-31, then solve problems 52, 53, 54, and 56 on

page 537.

4. Thursday(02/11): Demonstrations of the 5 Properties of Waves

for Light. HW: Complete Review Handout.

5. Friday(02/12): REVIEW I for Ch.19. HW: Complete Review Handout.

6. Monday(02/15): No School - Presidents Day. HW: Finish homework

assignments and study for test.

7. Tuesday(02/16): REVIEW II Chapter 19. HW: Finish all Review

Handouts.

8. Wednesday(02/17): Test on Ch.19- Interference and Diffraction

of Light. HW: Go to Web-site for notes and plans on Ch.20&21 - Static

Electricity and Electric Fields.

1. Light passing through a narrow hole or slit is diffracted, or bent from

a straight-line path. Light waves with the same wavelength and constant

phase differences interfere with each other to produce light and dark

interference patterns.

2. Interference between light diffracted from two closely-spaced narrow

slits causes an interference pattern to appear on a distant screen.

3. The wavelength of light can be measured by analyzing the double-slit

interference pattern. The equation is λ = xd/L .

4. In double-slit interference, the position of a bright fringe requires the

path difference between two interfering point sources to equal a whole

number of wavelengths.

5. Single slits produce diffraction patterns that are less well defined than

those formed by double slits. The equation is λ = yw/L .

6. In double-slit interference, the position of a dark fringe requires the

path difference between two interfering point sources to equal an odd

number of half-wavelengths.

7. Diffraction gratings with large numbers of evenly-spaced slits

produce interference patterns that are used to measure the wavelength

of light precisely. The equation is λ = dsinθ_n/n .

8. Light waves form a diffraction pattern by passing around an obstacle

or bending through a slit and interfering with each other.

9. Diffraction limits the resolving power of lenses.

10. The position of a maximum in a pattern created by a diffraction grating

depends on the separation of the slits in the grating, the order of the

maximum, and the wavelength of the light.

11. Colors in soap and oil films are caused by the interference of specific

colors of light reflected from the front and back surfaces of the thin film.

This occurs at odd multiples of λ/4 .

12. And still, we need these steps to solve any problem in Physics:

(i) read the problem and identify the given variables

(ii) determine what you are asked to solve for

(iii) find the correct motion formula to use

(iv) use algebra to isolate the unknown

(v) substitute-in the given information and simplify.

View the Slide Presentation.

Answers to Homework:

Pages 536-537: #47. 451 nm, #48. 94.0 nm, #49. 16.3 μm

#52. 600 nm, #53. 4.0x10^-4 cm, #54. .3 cm, #56. 1.1x10^-2 cm

THE HONORS PHYSICS ARCHIVES Ch.1: Physics Intro. Ch.2&3: Linear Motion. Ch.4&5: Forces. Ch.6: 2-Dim Motion. Ch.7: Gravitation. Ch.8: Rotary Motion. Ch.9: Momentum. Ch.10&11: Work&Energy. Ch.12: Thermal Energy. Ch.13: States of Matter. Semester Review. Ch.14&15: Waves&Sound. Ch.16: Study of Light. Ch.17&18: Reflect/Refract. Ch.19: Int/Diffraction.