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Laboratory setup "Fresnel formula (reflection and transmission coefficients from the surface of a dielectric at different angles)"

  • Study of the reflection of light waves with different polarization from the surface of a dielectric;
  • Registration of dependences of the reflection coefficient on the angle of incidence for s- and p-polarized waves;
  • Determination of the refractive index of a dielectric (optical glass).

The optical scheme of the setup is assembled on a vertical metal stand and includes a source of coherent radiation, a rotating disk with a glass sample and a digital light sensor.
The polarized coherent radiation source mounting unit provides beam direction change along two angular coordinates and source rotation around the longitudinal axis by 90⁰. The axis of the rotary disk with the sample is connected to a digital rotation angle sensor, which allows measuring the angle of incidence of radiation on the sample surface. The intensity of radiation reflected from one face of the sample is measured by a digital light sensor.

The computer scenario for conducting the experiment involves measuring the intensity of incident radiation (at the beginning of the experiment) and filling in a table with the columns “angle of incidence” and “intensity of reflected light” (during the experiment) with the simultaneous calculation of the reflection coefficient.
After the experiment, the data are displayed as a graph, and the results can be compared with literature data or calculations based on Fresnel formulas. The experiment is carried out for s- and p-polarized waves in the range of incidence angles of 5⁰ - 85⁰.

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