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9 Cards in this Set
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- Back
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how are all electromagnetic waves generated?
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By the acceleration of electric charge.
If a charge oscillates with frequency f, it radiates energy in the form of electromagnetic radiation at the same frequency. |
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wavelength spectrum of visible light
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700nm to 390nm
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the order of the colors in the visible spectrum from longest wavelength to shortest
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ROY G BIV
Red Orange Yellow Green Blue Indigo Violet |
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index of refraction
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n=c/v
where n is always 1 or GREATER THAN 1 since electromagnetic radiation travels slower in every medium than it does in a vacuum (c). |
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Snell's law
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is concerned with the angle of refraction, which (as with the angle of incidence) is measured from an imaginary line normal to the surface of the medium.
n1sin01=n2sin02 |
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when light crosses into a new medium, does frequency or wavelength change?
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Wavelength changes!
Frequency remains the same |
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if light crosses into a medium with a higher n value, what happens to the wavelength?
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If the n value increases, the speed decreases and thus the wavelength decreases too
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when light is about to travel into a medium with a lower n (index of refraction), what should you be thinking about?
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internal reflection and critical angle
light bends further away from the normal when entering a medium that is less dense, so if the incident angle in the dense medium is already too far away from the normal, then the light will just reflect back into the dense medium. |
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longer wavelengths (lower frequences) move faster/slower?
through a medium than shorter wavelengths (higher frequencies)? |
longer wavelengths move FASTER!!
and therefore bend less dramatically at the media surfac\\\\\\\ |
