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S10P1CLec25A - Physics 1C Lecture 25A"You cant trust your...

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Physics 1C Lecture 25A "You can’t trust your eyes it is your imagination that is out of focus." --Mark Twain
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Diffraction Grating The diffraction grating consists of many equally spaced parallel slits. A typical grating contains several thousand lines per centimeter. You will again get a diffraction pattern that consists of bright and dark spots. The bright spots will be sharper than the double slit case.
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Diffraction Grating The condition for maxima is: where m is 0, 1, 2 .... A central maximum is defined and the angle θ is still measured with respect to the centerline. The dark spots will be wider than the double slit case. d sin θ bright = m λ
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Polarization of Light Light from the sun is produced by the vibrations of multitude of atoms located there. Each atom produces a wave with its own orientation of the electric field. All directions of the electric field vector are equally possible and are in a plane perpendicular to the direction of propagation. This type of wave is known as an unpolarized wave.
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Polarization of Light A wave is said to be linearly polarized if the resultant electric field vibrates in the same direction at all times at a particular point. It is possible to polarize an unpolarized beam. The most common technique for polarizing light is called polarization by selective absorption.
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Polarization of Light In this technique, you use a material that transmits waves whose electric field vectors in that plane are parallel to a certain direction. This material also absorbs waves whose electric field vectors are perpendicular to that direction. This device is known as a polarizer.
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