Figure 28-1Constructive and Destructive Interference
Figure 28-17Diffraction of Water Waves
Diffraction: the process by which a beam of light or other system of waves is spread out as a result of passing through a narrow aperture or across an edge.
Figure 28-4Huygens’s Principle
Figure 28-2Two Radio Antennas Transmitting the Same Signal
2 1
2 1
constructive interference
1 destructive interference
2
m
m
Figure 28-3Young’s Two-Slit Experiment
Figure 28-5Path Difference in the Two-Slit
Experiment
sin m=0, 1, 2, 3...
1sin m=0, 1, 2, 3...
2
Condition for bright fringes
d m
Condition for dark fringes
d m
Figure 28-6The Two-Slit Pattern
Figure 28-18Single-Slit Diffraction
Figure 28-19Locating the First Dark Fringe in Single-Slit Diffraction
Figure 28-20Locating the Second Dark
Fringe in Single-Slit Diffraction
Condition for dark fringe
sin m= 1, 2, 3...
W m
Figure 28-26Path-Length Difference in a Diffraction Grating