Lecture 18 Notes

# Lecture 18 Notes - Recap of last lecture The wavelength...

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Recap of last lecture The wavelength dependence of refraction is called dispersion n a = c/v a = λ 0 / λ a Certain materials block EM waves polarized light in a particular direction If the angle between the polarization axis of two consecutive polarizers is θ the intensity if the light after passing through the two polarizers is I 0 cos 2 θ , where I 0 is the intensity of light after passing through the first polarizer There are two states of linear polarization of light

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Polarization by reflection Unpolarized light can be partially or totally polarized by reflection
Polarization by reflection If angle of incidence tan θ p = n b /n a the reflected ray is completely polarized parallel to the interface Unpolarized light can be partially or totally polarized by reflection

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Answers to reading quiz Sunglasses with polaroid filters (linear polarizers) are substantially more expensive compared to regular sunglasses. Are they worth the extra money? Why? How can you check if a pair of sunglasses has a polaroid filter or not? They are because they can reduce the intensity of the electromagnetic rays coming in rather than just coloring them. Test them by holding them up to another pair and rotating them to see if the amount of visible light varies . They are definitely worth the extra expense: polarized sunglasses physically reduce the light coming through the lens rather than using an opaque lens that obscures your vision, allowing for better clarity that regular sunglasses. To tell if your sunglasses are polarized, take one of the lens and orient it 90 degrees rotated compared to the other lens. If
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## This note was uploaded on 01/27/2012 for the course PH 2233 taught by Professor Dipinkardutta during the Spring '11 term at Mississippi State.

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Lecture 18 Notes - Recap of last lecture The wavelength...

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