Available Photonics Experiments:

P5823 Refraction through prisms PDF Download page

  • Refraction of prisms
  • Angle of minimum deflection
  • Complementary colour
  • Dispersion
  • Prism spectrometer
  • Examples of investigations and measurements
OX-03.01 Refraction on a prism
A set of two prisms each mounted on a turn table (12) are used to measure the deflection of the beam in relation to the angle of incidence. The angle of incidence is changed by turning the prism in its holder. The provided scale allows the reading of the incident angle. The rotatable arm of the swivel unit (1) is turned in such a way that the beam of the green probe laser (4) always hits the centre of the scale on the white screen (9). The rotatable arm also has its angle reading providing the information of the beam deflection in units of degrees. The recorded results will show a particular angle - the angle of the minimum deflection. In this case the beam propagates parallel to the base of the prism. Especially the knowledge of the angle of minimum of deflection allows the calculation of the index of refraction index for the specific material. The experiment comes with an SF10 and PMMA prism.
EXP-03.02 Spectrum of white light LED
As a white light source a high brightness white LED (6) is used. By means of the controller (5) the LED is provided with the necessary voltage. Each light source connected to it will be recognised by the internal microprocessor and the proper voltage and current range provided. Although the light appears white, it consists in fact of three dominant lines, green, red and blue. These lines spectrum is separated by the prism and can be observed on the optical screen (9). By means of the lenses (3) mounted in its holder (13) the spatial recombination of the spectrum results ins the original white light. With the small beam block (11) which can be moved between the imaging lenses certain colour in the spectrum can be blocked and generates its complementary colour when recombined on the screen.
OX-03.03 Fraunhofer's prism spectroscope
The principle of a Fraunhofer's apparatus is demonstrated by the set-up as shown on the left. The spectral lines of the LED (6) used to determine the SF10 and PMMA prism’s dispersion. The spectral lines are imaged by means of the lens (3) mounted in its holder (13) onto the optical screen (9) having a vertical and horizontal scale. The screen is mounted to the holder (9).
  • P5832 Refraction through prisms consisting of:
12B-11001Joint angle connector with socket
24B-06101Achromat f=40 mm, diameter 25.4 mm, mounted in click 30 mm
34B-06502Biconvex lens f=100 mm, diameter 25.4 mm, click 30
44S-02261Dimo diode laser module, 532 nm (green), DPSSL
5ED-00101Adaptive power supply APS-05
6LS-00101LED white
7MC-00021Profile Rail MG-65, 200 mm
8MC-01001Screen holder on carrier 20
9MC-01121Optical screen 80 mm x 40 mm with horizontal and vertical scale
10MC-02501Profile Rail MG-65, 300 mm
11XM-01801Carrier with magnetic beam block on post
12XM-10201Prism assembly
13XM-11003Mounting plate, including carrier 20 mm , C30
14XM-11101Adjustment holder, 4 axes, carrier 20 mm