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Chapt_37 - University Physics(Prof David Flory Chapt_37...

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University Physics (Prof. David Flory) Chapt_37 Monday, August 06, 2007 Name: __________________________ Date: _____________ ___ 1. If we increase the wavelength of the light used to form a double-slit diffraction pattern: A) the width of the central diffraction peak increases and the number of bright fringes within the peak increases B) the width of the central diffraction peak increases and the number of bright fringes within the peak decreases C) the width of the central diffraction peak decreases and the number of bright fringes within the peak increases D) the width of the central diffraction peak decreases and the number of bright fringes within the peak decreases E) the width of the central diffraction peak increases and the number of bright fringes within the peak stays the same ___ 2. When a highly coherent beam of light is directed against a very fine wire, the shadow formed behind it is not just that of a single wire but rather looks like the shadow of several parallel wires. The explanation of this involves: A) refraction D) the Doppler effect B) diffraction E) an optical illusion C) reflection ___ 3. A diffraction grating of width W produces a deviation θ in second order for light of wavelength λ . The total number N of slits in the grating is given by: A) 2 W λ / sin θ B) ( W / λ ) sin θ C) λ W /2 sin θ D) ( W /2 λ ) sin θ E) 2 λ / sin θ ___ 4. The dispersion of a diffraction grating indicates: Write the letter for the correct answer on the answer sheet. Write clearly. Page 1
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