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PY208N-Lecture-35 - Physics 208N-004 Lecture#35 15 April...

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1 A diffraction grating consists of a large number of equally spaced narrow slits or lines. A transmission grating has slits, while a reflection grating has lines that reflect light. The more lines or slits there are, the narrower the peaks. Physics 208N-004 Lecture #35 – 15 April 2011 Chapter 37: 2, 3 Photon Properties 35-7 Diffraction Grating & Ch 35 Summary The maxima of the diffraction pattern are defined by 35-7 Diffraction Grating Example 35-8: Diffraction grating: lines. Determine the angular positions of the first- and second- order maxima for light of wavelength 400 nm and 700 nm incident on a grating containing 10,000 lines/cm.
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2 35-7 Diffraction Grating Example 35-9: Spectra overlap. White light containing wavelengths from 400 nm to 750 nm strikes a grating containing 4000 lines/cm. Show that the blue at λ = 450 nm of the third-order spectrum overlaps the red at 700 nm of the second order. Conceptual Example 35-10: Compact disk. When you look at the surface of a music CD, you see the colors of a rainbow. (a) Estimate the distance between the curved lines (to be read by the laser). (b) Estimate the distance between lines, noting that a CD contains at most 80 min of music, that it rotates at speeds from 200 to 500 rev/min, and that 2/3 of its 6-cm radius contains the lines. Light bends around obstacles and openings in its path, yielding diffraction patterns. Light passing through a narrow slit will produce a central bright maximum of width Minima occur at Summary of Chapter 35 Diffraction limits the resolution of images. Diffraction grating has many parallel slits or lines; peaks of constructive interference are given by Polarized light has its electric field vectors in a single plane.
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