290 likes | 381 Views
ACCESS– Summer 2014 Interference of Light. Gernot Laicher University of Utah - Department of Physics & Astronomy. For small angles. y min = radius of first dark ring q = diameter of hole d = distance from hole to screen. d sin Q n (= difference in path length). Q n. d. Diffraction
E N D
ACCESS– Summer 2014Interference of Light GernotLaicher University of Utah - Department of Physics & Astronomy
For small angles ymin = radius of first dark ring q = diameter of hole d = distance from hole to screen
d sin Qn (= difference in path length) Qn d Diffraction grating Whenever d sin Qn = ml : All waves are in phase (constructive interference); m = 0,1,2…. Otherwise they cancel each other (destructive interference). Different l means constructive interference for different Qn !