General Physics II, Physics 112

UNIT 4: Optics and Modern Physics

SCHEDULE

EXAM 4: Monday May 14 at 10:00

Physics simulation website (requires Java)

• For Blackbody radiation simulation, select "Light and Radiation"
• For photoelectric effect simulation, select "Quantum Phenomenon"

INFORMATION

Answers to practice problems

1. Ray leaves top at an angle of 51 degrees from normal
2. a) 40 cm to left b) virtual,upright c) image size is 10 mm, 5X object size
3. Incidence angle of 49 deg at bottom
4. Wavelength is 667 nm
5. a) angle is 0.186 deg b) PL difference is 1625 nm
6. Two phase reversals,destrucive: t = 86 nm b) 345 nm, 2.1E8 m/s c) 249 nm
7. Work function is 2.3 eV, so KEmax is 0.2 eV

Exam 4 outline

• CHAPTER 22, REFLECTION AND REFRACTION
• Relation between index of refraction and speed, wavelength, and frequency in a medium
• Apply laws of reflection, refraction to determine reflection,refraction angles
• Find the critical angle
• Be able to draw diagrams showing incident, reflected, refracted rays for various situations
• Be able to find the angle between reflected, refracted rays, etc
• Do problems with refractions/reflections at two consecutive surfaces; either parallel or at right angles
• CHAPTERS 23/25, CONVEX LENSES, IMAGES AND OPTICAL INSTRUMENTS
• Use thin lens equation to get location of image, etc
• Sketch reasonably accurate diagram showing object, lens, and image
• Determine the size of an image
• Distinguish between real/virtual images, erect/inverted images
• Determine the angular magnification of a magnifying glass
• CHAPTER 24, WAVE OPTICS
• Know the relationship between constructive/destructive interference and the phase of 2 added waves
• Use double slit interference equation to get location of bright, dark fringes
• Determine the path length difference at double slit interference bright/dark fringes
• Thin film interference: use equations for constructive/destructive interference; determine phase reversals
• Single slit diffraction: get location of dark areas, width of central bright area
• Diffraction grating; determine angle of bright interference lines, etc.
• CHAPTER 27, QUANTUM PHYSICS
• Blackbody radiation: be able to use Wien displacement law
• Calculate photon energy from frequency/wavelength, and vice versa
• Do photoelectric effect problems

CHAPTER OUTLINES

Chapter 22:Reflection and refraction

• Reflection and refraction, Snell's law: sections 2,3
• Dispersion, rainbows, etc: sections 4,5,6
• Total internal reflection, critical angle: section 7

Chapter 23:Lenses and image formation

• Image formation by mirrors: sections 1-3
• Thin lenses: section 6
• Chromatic and spherical abberations: section 7

Chapter 25:Optical instruments

• Cameras: section 1
• The eye: section 2
• Magnifying glass: section 3
• Microscope and telescope, sections 4,5

Chapter 24: Wave optics

• Huygens Principle: Chapter 22(!), section 6
• Interference and double slit interference: sections 1,2
• Reflection and thin film interference:sections 3,4
• Diffraction:sections 6,7
• Diffraction grating: section 8

Chapter 26: Special Relativity

• We'll do a one-day survey of special relativity. Read what you like from chapter 26
• To learn more about special relativity I recommend "Spacetime Physics" by Edwin Taylor and John Wheeler

Chapters 27,28: Quantum and atomic physics

• Blackbody radiation: section 27.1
• The photoelectric effect and photons: section 27.2
• The dual nature of light and matter: section 27.6
• Atomic spectra and the Bohr model: sections 28.1,28.2, and 28.3

ASSIGNMENTS

Week 12 Assignments

• Due Monday (4/17):Ch 22 problems 9,11,13. Read sections 22.1,22.2,22.3
• Wed: Ch 22 problems 21,23. Read ch 22 sections 4-7
• Fri: Ch 22 problems 19,30,38,49

Week 13 Assignments

• Due Monday (4/23): Ch 23 problems 27,29; read ch 23 section 6
• Tuesday: chapter 25 problems 3,4; Read chapter 25 sections 1,2,3
• Wed: Ch 23 problem 36, ch 25 prblems 1,17; read ch 25 section 4
• Fri: Read chapter 24, sections 1 and 2

Week 14 Assignments

• Due Monday (4/30): Ch 24 problems 1,2,3. Read ch 24 sections 1-4
• Tuesday: Ch 24 problems 6,14,17. Read ch 24 sections 3,4
• Wed: Ch 24 problems 18,29,35. Read ch 24 sections 6,7,8
• Friday: Ch 24 problems 29,30,37
• Quiz Friday over wave optics

Week 15 Assignments

• Due Monday 5/7: Chapter 27 problems 1,2; read chapter 27 section 1
• Due Tuesday: Ch 27 problems 1,2,4,5
• Wed: Ch 27 problems 8,11,14; read section 2

EXAM 4: Monday 5/14 at 10:00