The Wave Nature of Light
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Last updated 1:28 PM on 12/20/22
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19 Terms
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Dispersion
The spreading of light into a spectrum of colours
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Total Internal Reflection
Going from a more optically dense to a less optically dense medium where the refracted light reflects back into the more optically dense medium
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Transverse wave
Direction of travel is perpendicular to motion of source
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Longitudinal Wave
Direction of travel is parallel to motion of source
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Electromagnetic Radiation
Made up of oscillating E-Fields and B-Fields which are perpendicular to each other
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In which direction is the energy of the wave transmitted
along the x-axis
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E-fields and B-fields are __ to the wave’s _________.
perpendicular, transmission of motion
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What speed do electromagnetic wave’s travel at?
the speed of light
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Do electromagnetic waves travel at different speeds in different mediums
yes, this results in refraction
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Polarization from Reflections
When light strikes a surface, E-fields perpendicular to surface are absorbed and only horizontal E-fields are reflected.
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Polarization only happens from…
less to more
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Brewster’s Angle
100% Polarization off a surface reflection is attained when the refracted ray is orthogonal to the reflected ray:
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Malus’ Law
1. Half of the exiting light will be lost due to a plane polarizer
2. Two polarizers orthogonal to one another will block all light
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Liquid Crystal Displays (LCD)
Liquid Crystals can be aligned by an electric potential
In the correct orientation, the crystals cause a rotation of light by 90°
Phenomenon known as the optical activity of the liquid crystals
In the correct orientation, the crystals cause a rotation of light by 90°
Phenomenon known as the optical activity of the liquid crystals
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Fixed end reflection
Energy reflected and return pulse is inverted
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Free end Reflection
No inversion in return pulse
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Less dense medium to more dense medium
Transmitted signal is attenuated upright, wavelength is shortened, and velocity is decreased
Reflected signal is inverted
Reflected signal is inverted
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More dense medium to less dense medium
\- Transmitted signal is amplified upright, wavelength is increased, and velocity is increased
Reflected signal is upright
Reflected signal is upright
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Diffraction
Bending of waves around small obstacles