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Chaulnes Method

Mathematic

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Chaulnes Method

  1. Goals of experiment:

The experiment presents a method of determining the refraction index for materials that are optic solid and shutter by Chaulnes Method



  1. theory:

The refraction index which defines optical the mediums is the ratio between the speed of light in vacuum and the speed of light in the medium.

n=c/v

The relative index of refraction is the ration between the absolute index of refraction of the two mediums

n21=n2/n1

Chaulnes Method of determination of the refraction index for transparent solids based on the refraction phenomena. This phenomenon is the change of the propagation direction of a ray of light on a surface of two transparent mediums. The ration between sinus of the incident angel and sinus of the refraction one is a constant measurement for two mediums and is equal with the relative index of refraction

sin i/sin r = n21


we had 5 glasses and one Plexiglas, and these are the refraction indices:

Medium

Refraction indices

Error

Glass 1




1.53

0.045

Glass 2

2.64

Glass 3

3.08

Glass 4

2.86

Glass 5

3.25

Plexiglas

2.82

The errors are made by:

  • glasses impurities (they deviate the light)
  • bad calibration of the microscope (R was not easy to read)








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