27A dbl slit, interference

# 27A dbl slit, interference - Outline Physics 1C Lecture 27A...

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5/18/2011 1 Physics 1C Lecture 27A "Any other situation in quantum mechanics, it turns out, can always be explained by saying, ‘You remember the experiment with the two holes? It’s the same thing.’ " --Richard Feynman Outline Ray diagrams, most easily understood by considering particle nature of light. Two mirror system. Interference, reflecting wave nature of light. Double slit experiment. Thin films. Microscope – two lens system Virtual enlarged image formed by eyepiece. Magnification the product of those of the two lenses. Two lenses – objective and eyepiece Real image formed by objective Becomes object for eyepiece Interference Treating light as a particle (geometrical optics) helped us to understand how images are formed by lenses and mirrors by constructing ray diagrams. But we can understand different phenomena by treating light as a wave. For example, light waves will interfere with each other just like the sound waves and waves on a string that we dealt with earlier. This means we can get areas of constructive interference and destructive interference just like we had when we produced standing waves. Interference In order to create sustained interference, you need two sources with identical wavelengths ( monochromatic ) that are coherent . Interference Coherence means that the waves must maintain a constant phase with respect to each other.

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5/18/2011 2 Double Slit Experiment Two narrow slits, S 1 and S 2 , can act as sources of waves. The waves emerging from the slits originate from the same wavefront and therefore are always in phase (coherence). The light from the two slits forms a visible pattern on a screen. The pattern consists of a series of bright and dark parallel bands called fringes .
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27A dbl slit, interference - Outline Physics 1C Lecture 27A...

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