Diffraction is the bending of waves around obstacles.
Huygens Principle: Every point on a wave front acts as a source of wavelets that move forward at the wave speed; the wave front at a latter time is the surface tangent to the wavelets.
Diffraction of light from a narrow slit: If the screen is far away, the first dark fringe occurs for an angle theta given by
Sin (theta) = lambda / W
where lambda is the wavelength of light, W is the width of the slit, and theta is the angle that the line from the center of the slit to the dark fringe makes with the line from the center of
the slit to the central maximum.
In general dark fringes occur at angles theta given by
Sin(theta) = m * lambda / W
where m = 1, 2, 3, The bright fringes are situated halfway between the dark ones.
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
The book offers a complete review of your AP course, strategies to give you the edge on test day, and plenty of practice with AP-style test questions. It includes full length practice exams modeled on the real test and all the terms and concepts you need to know.
This book includes a review of all the topics tested including vectors, kinematics, fluid mechanics, optics and nuclear physics. Additionally, the book includes two full length tests made complete with descriptive solutions, and quick study tables for Physics B formulas and equations.