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Friday, 27 June 2014 10:28

M8-05: POLAROIDS AND KARO SYRUP - SPECTRUM

m8-05am8-05bm8-05cm8-05d

 

Additional Info

  • ID Code: M8-05
  • Purpose: Demonstrate explicitly that the angle of rotation of polarized light in an optically active medium is a function of wavelength.
  • Description:

    The prism spectrum part of the experiment consists of a bright point source with condenser lens and iris, a 20 cm focal length cylindrical convex lens which focuses light onto a slit, and a 20 cm focal length spherical lens which focuses the light passing through a prism onto a distant screen. After the spectrum is aligned, the optical activity arrangement, consisting of a uniform plastic cylinder of Karo syrup between two rotatable polaroids, can be positioned between the cylindrical lens and the slit, as seen in the photograph. As either polaroid is rotated a dark band moves through the spectrum, because the polaroid absorbs the color/wavelength that has rotated by that angle.

    The color of the light passing through the polaroid/Karo syrup system is a series of negative colors: white minus the color removed by the polaroids. The spectra are shown above (left to right): white light, cyan (minus red), magenta (minus green), and yellow (minus blue) respectively.

  • Availability: Available
Read 689 times Last modified on Wednesday, 03 September 2014 18:10
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