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Unformatted text preview: 1 Physical Optics 2 Diffraction Diffraction Effects Diffraction Effects: from a slit from a penny 2 Single Slit Diffraction Diffraction Pattern and brightness plot from a single slit • now we do not assume that slit is of negligable size • light from different parts of slit interferes on screen • get bright central region and side bright and dark regions Procedure for SingleSlit Diffraction • minima occur at angles of sin m = m /a , m = +/ 1, 2, 3 Clicker: Light of wavelength passes through a single slit of width a . The diffraction pattern is observed on a screen a distance x from the slit. Which of the following will give the greatest increase in the angular width of the central diffraction maximum? 1. double the slit width a and double the wavelength 2. double the slit width a and halve the wavelength 3. halve the slit width a and double the wavelength 4. halve the slit width a and halve the wavelength 3 Clicker: Light of wavelength passes through a single slit of width a . The diffraction pattern is observed on a screen a distance x from the slit. Which of the following will give the greatest increase in the angular width of the central diffraction maximum? double the slit width nd 1. double the slit width a and double the wavelength 2. double the slit width a and halve the wavelength 3. halve the slit width a and double the wavelength 1 2 3 4 0% 0% 0% 0% 0 of 5 4. halve the slit width a and halve the wavelength 20 Ex: light of = 589 nm falls on a slit of width a = 0.482 mm. (a) find the angle at which the 3 rd minimum occurs (b) if the screen is located 1.5 m away, what is the distance between the central maximum and the 1 st dark fringe? Clicker: The figure shows two singleslit diffraction patterns....
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This note was uploaded on 03/22/2011 for the course MAC AEPH114 taught by Professor Knutt during the Spring '11 term at McGill.
 Spring '11
 KNUTT

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