Astronomy picture of the day [Solar Dynamics Observatory (SDO) Atmospheric Imaging 
Assembly (AIA) image at 30.4 nm]

Phys 4C Light and Modern Physics - 2020 Spring

Instructor: Professor Ringwald
E-mail: ringwald[at] and replace [at] with @
Phone: (559) 278-8426
Also: (559) 278-2371

Office: McLane Hall J-wing Room 11 (east of McLane 161 and the ground-floor Women's Room)
Office hours (between January 21 and May 7): I am sorry, but because of the coronavirus pandemic, I must suspend office hours for the rest of 2020 Spring semester. If students have questions, please send me email.

Education is fundamentally a self-directed activity. One gets out of it what one puts into it, and one needs to pursue it actively

Please therefore feel free to contact me if you have any problems in this course, or if you're doing well, and just want to talk. It's in my interest, and I care, that you do well!

Click here for the
Course Syllabus
Click here for the
Course Schedule
Click here for the
Homework Assignments
Click here for the
Formula List
provided on all exams,
and useful for homework
(This is a pdf file,
which you can read with
Adobe Acrobat Reader, a free program available here.)
Click here for the
Solutions to the Homework
and Exams;

also Class Videos,
Class Notes,
and Class PowerPoints

(Updated 5/11.)

News, updated on 2020 May 26:

Go to Professor Ringwald's home page

Webpage by Professor Ringwald (ringwald[at] and replace [at] with @)
Department of Physics, California State University, Fresno. Please read this disclaimer.