Interference & Diffraction
Look all around you, interference and diffraction
From every surface there's reflection and refraction
We understand these phenomena from waves
So, it is clear that's the way that light behaves
Look all around you at the EM radiation
Electric and magnetic fields in oscillation
Travelling through a vacuum at speed c
C/n, considered generally
Light's a wave, but it behaves like a particle too
That's the way it can do all the things it can do
Light's a wave like a swell on stormy seas
Light displays wave properties
Like phase, amplitude, wavelength, and frequency
Laser on a double slit projected on a screen
See a pattern of bright spots, with dark spots in between
Light emitted from each slit will interact and interfere
When the path difference is one full wave
A bright spot will appear
Laser light on a single slit, what do we observe?
Light diffracts through the opening, the wavefront seen to curve
Many secondary sources of light each emitting waves
But light plus light equals dark
When those sources are out of phase
Light's a wave, but it behaves like a particle too
That's the way it can do all the things it can do
Light's a wave like a swell on stormy seas
Light displays wave properties
Light's a wave, but it behaves like a particle too
That's the way it can do all the things it can do
Light's a wave like a swell on stormy seas
Light displays wave properties
Like phase, amplitude, wavelength, and frequency
From every surface there's reflection and refraction
We understand these phenomena from waves
So, it is clear that's the way that light behaves
Look all around you at the EM radiation
Electric and magnetic fields in oscillation
Travelling through a vacuum at speed c
C/n, considered generally
Light's a wave, but it behaves like a particle too
That's the way it can do all the things it can do
Light's a wave like a swell on stormy seas
Light displays wave properties
Like phase, amplitude, wavelength, and frequency
Laser on a double slit projected on a screen
See a pattern of bright spots, with dark spots in between
Light emitted from each slit will interact and interfere
When the path difference is one full wave
A bright spot will appear
Laser light on a single slit, what do we observe?
Light diffracts through the opening, the wavefront seen to curve
Many secondary sources of light each emitting waves
But light plus light equals dark
When those sources are out of phase
Light's a wave, but it behaves like a particle too
That's the way it can do all the things it can do
Light's a wave like a swell on stormy seas
Light displays wave properties
Light's a wave, but it behaves like a particle too
That's the way it can do all the things it can do
Light's a wave like a swell on stormy seas
Light displays wave properties
Like phase, amplitude, wavelength, and frequency
Credits
Writer(s): Duncan Fisher
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