The wave nature of light Physics Department, New York City College of Technology.

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From water waves to light waves. So far, we have learned that the particle theory and the wave theory of light both predict the observed phenomena's of.
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Presentation transcript:

The wave nature of light Physics Department, New York City College of Technology

Key words Huygens’ principle Interference Diffraction Young’s double-slit experiment

Huygens’ principle Every point on a wave front can be considered as a source of tiny wavelets that spread out in the forward direction at the speed of the wave itself.

Interference - Young’s double slit experiment Constructive interference Occurs when m is the order of the interference fringe

Young’s double slit experiment Destructive interference Occurs when

Microwave double slit interference Insert video Disc 23, #10

Example #1 Laser wavelength

Diffraction Diffraction refers to the spreading or bending of waves around edges.

Diffraction by a single slit The minima occur at Note that m=0 corresponds to the strongest maximum

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