Chapter 17 LecturesTuesday, March 23, 2010

10:03 PM

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Diffraction:

Double-slit interference pattern:

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Single-slit diffraction

Huygens's principle of wave propagation

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Example: CP 29 (page 570) A professor uses a razor blade to cut a thin slit in a piece of aluminum foil. When she shines a laser pointer (wavelength = 680 nm) through the slit onto a screen 5.5 m away, a diffraction pattern appears. The bright band in the centre of the pattern is 8.0 cm wide. Determine the width of the slit.

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Diffraction from circular apertures

Solution:

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Example: CP 35 (page 570) You want to photograph a circular diffraction pattern whose central maximum has a diameter of 1.0 cm. You have a helium-neon laser (wavelength = 633 nm) and a 0.12-mm-diameter pinhole. How far behind the pinhole should you place the viewing screen?

Solution:

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