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Physics 122 – Class #4
Questions?
Announcements/reminders
MP HW01 and written HW01 are due next Tuesday, September 2.
Read actively Ch.20 through page 574
Always check the class website to make sure of assignments and due dates.(http://www.physics.nmt.edu/~saska/phys122.html)
IClickers. Friday the latest they should have them in the library. We start next week!
Physics 122 – Class #4
Last class: Lenses.
Today: Spherical mirrors and Traveling Waves.
Sign convention for lenses
Spherical mirrors Form images by reflection. Law of reflection always obeyed! Used for telescopes, binoculars, monitoring mirrors, ...
Spherical mirrors Three special rays ...
1) Parallel to the Principal axis. After reflection passes through the Focal Point (F).
2) Passes through (or is headed toward) the focal point, and reflects parallel to the principal axis.
3) ..Passes (or it is headed toward) the center of curvature and is reflected back along the same line.
Images in spherical mirrors
Case 1: Concave mirror, s > f
Images in spherical mirrors
Case 1: Concave mirror, s < f
.
Images in spherical mirrors
Case 1: Convex mirror.
Always virtual image
Mirror equation
Ch.20: Traveling WavesA waves is a traveling disturbance – organized motion of the particles in the medium.
The particles of the medium do not travel with the wave! They oscillate around an equilibrium point… The wave is transferring energy in the direction it propagates.
Types of waves …* Longitudinal and Transverse
*Material and Electromagnetic
Snapshots and history graphs
Snapshots and history graphs
Sinusoidal Waves
Sinusoidal Waves
Mathematically express D(x,t)=?
Mathematically express D(x,t)=?
Mathematically express D(x,t)=?
Mathematically express D(x,t)=?
Wave on a String
Wave on a String
Wave on a String
Wave on a String
Wave on a String
Example 1A 43 meters long rope of mass 5.0 kg joins two climbers. One climber strikes the rope and 1.4 seconds later the second climber feels the effect. What is the rope tension?
Example 1A 43 meters long rope of mass 5.0 kg joins two climbers. One climber strikes the rope and 1.4 seconds later the second climber feels the effect. What is the rope tension?
2D and 3D Waves
2D and 3D Waves
Phase ...
Example 20.4 (phase)
Example 20.4 (phase)
Sound Waves
Electromagnetic Waves
Electromagnetic Waves
Example 20.8Orange light with a wavelength of 600 nm is incident upon a 1.00 mm thick glass microscope slide.a. What is the light speed in the glass?b. How many wavelengths of light are inside the slide?