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Diffraction

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  • dandrebchristopher
    Diffraction is normally taken to refer to various phenomena which occur when a wave encounters an obstacle. Very similar effects are observed when there is an
    Message 1 of 42 , Jul 1, 2008
      Diffraction is normally taken to refer to various phenomena which
      occur when a wave encounters an obstacle. Very similar effects are
      observed when there is an alteration in the properties of the medium
      in which the wave is travelling, for example a variation in
      refractive index for light waves or in acoustic impedance for sound
      waves and these can also be referred to as diffraction effects.
      Diffraction occurs with all waves, including sound waves, water
      waves, and electromagnetic waves such as visible light, x-rays and
      radio waves. As physical objects have wave-like properties,
      diffraction also occurs with matter and can be studied according to
      the principles of quantum mechanics.

      While diffraction occurs whenever propagating waves encounter such
      changes, its effects are generally most pronounced for waves where
      the wavelength is on the order of the size of the diffracting
      objects. The complex patterns resulting from the intensity of a
      diffracted wave are a result of the superposition, or interference
      of different parts of a wave that traveled to the observer by
      different paths.

      The formalism of diffraction can also describe the way in which
      waves of finite extent propagate in free space. For example, the
      expanding profile of a laser beam, the beam shape of a radar antenna
      and the field of view of an ultrasonic transducer are all explained
      by diffraction theory.
    • Khristelle anne Gaspar
      Diffraction refers to various phenomena which occur when a wave encounters an obstacle.
      Message 42 of 42 , Jan 10, 2012
        Diffraction refers to various phenomena which occur when a wave encounters an obstacle.
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