Lesson 4.5 - Light as an Electromagnetic Wave
VIDEO LESSON (16:26 min)
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[translation: determined so they satisfy them]
One form of solutions is waves at right angles to each other and bth at right angles to the direction of propagation.
Watch this VIDEO (17:34 min) for more on Polarizers.
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EVIDENCE THAT LIGHT IS A WAVE
RECALL: MAXWELL'S EQUATIONS
ELECTROMAGNETIC (EM) RADIATION AS A WAVE
Maxwell's Equations can be solved for \( \vec{E}(\vec{r},t)\) and \( \vec{B}(\vec{r},t)\).[translation: determined so they satisfy them]
One form of solutions is waves at right angles to each other and bth at right angles to the direction of propagation.
SPEED OF THE WAVE
When solving the equations it turned out that the speed of this wave has to be travelling at a speed defined to be
POLARIZATION
An EM wave is not only determined by its direction of propagation but also the direction of the electric field. We call this the polarization of the light.Light produced in a lamp has random polarization. All the electromagnetic waves have electric field in random directions.
Polarizing Filter is a material that absorbs one direction of polarization and lets the other pass.
APPLICATIONS:
Watch this VIDEO (17:34 min) for more on Polarizers.
Sửa lần cuối: Thứ hai, 23 Tháng 6 2025, 11:23 PM