Lecture 42   iq37

1. Derivation of the Snell’s law

o Propagation of wave front in region 1 and in region 2.

o The transition region

o There are emission of wavelets along the wave front AB’

The tangent to all wavelets defines the new wave front BB’

2. Young’s double slit experiment.

o Superposition of two coherent waves, with same frequency and same amplitude

o Conditions on the maxima in the path difference Delta r, and in the phase difference \phi=k Delta r.

o The intensity distribution in the double slit experiment.

3. Intensity distribution on a circular screen.

4. Textbook 25.P.22. Double slit experiment with polarized sources.

Class announcement:

o The updated course summary of unit 4 has been posted with the date 4/21/13.

o Mark your calendar: Review on unit4, 5-6 pm on Wed (May1). Location CPE 2.212.

o Extra office hour: Thursday 2:30 to 3:30.

o From Lisa The Fall 2013 LA Application (aka Undergraduate TA) is available on the table across from my office, RLM 5.216. Please let all interested students know. The deadline is extended until May 3, 2013.

*Lisa’s contact information: Undergraduate Coordinator, Department of Physics

Ph: 512-471-8856  Fax: 512-471-9637

email address: ugaffairs@physics.utexas.edu