3 Wave Optics SCPY152 General Physics II June 19, 2015 Udom
Robkob, Physics-MUSC
Slide 2
Topics Light waves Phasor Huygenss principle Law of
superposition Double slit interference Multiple slit interference
Thin films Single slit diffraction Single hole diffraction Double
slit diffraction Grating diffraction
Slide 3
Light Waves Light waves Plane wave = sinusoidal field
Slide 4
Phasor Rotating vector = phasor
Slide 5
Law of Superposition Law of superposition
Slide 6
Law of Superposition Phasor diagram
Slide 7
Double Slit Interference Coherent light source = monochromatic
light sources generate light waves in phase Young double slit
experiment
Slide 8
Double Slit Interference Path different y
Slide 9
Double Slit Interference Path different y What is equation for
destructive interference?
Slide 10
Multiple Slits Interference In case of triple slit
interference
Slide 11
Multiple Slits Interference In case of triple slit interference
Three phasors are determined
Slide 12
Multiple Slits Interference In case of triple slit interference
Three phasors are determined
Slide 13
Multiple Slits Interference In case of triple slit interference
Three phasors are determined Let try to analyze four slit
interference pattern!
Slide 14
Interference from Thin Films Let us determine thin transparence
film of refractive index n and thickness d. There are interferences
at the front side and back side of the film. We determine
interference between light come from the front surface and the back
surface of the film.
Slide 15
Thin Film Interferences In case of front side interference The
interference depends on path different 2d and phase different of
the two light beams
Slide 16
Thin Film Interferences In case of n>n o, the first beam has
phase shift from reflection at the front surface but not the second
beam Destructive Interference:
Slide 17
Thin Film Interferences Exercise
Slide 18
Thin Film Interferences Exercise
Slide 19
Thin Film Interferences In case of non-uniform film
Slide 20
Thin Film Interferences In case of non-uniform film In case of
n>n 0, for destructive interference
Slide 21
Thin Film Interferences Newtons rings R
Slide 22
Thin Film Interferences Newton rings analysis
Slide 23
Diffraction Phenomena We can see light diffraction in many
places
Slide 24
Huygenss Principle Huygenss principle Every point on the wave
front becomes a new source of the wave"
Slide 25
Single Slit Diffraction Single slit diffraction
Slide 26
Single Slit Diffraction Phasor analysis
Slide 27
Single Slit Diffraction Phasor analysis
Slide 28
Single Slit Diffraction Phasor analysis-destructive
interference Path different
Slide 29
Single Slit Diffraction Phasor analysis-destructive
interference Path different