Available Photonics Experiments:

P5824 Refraction through lenses PDF Download page

  • Convex lens
  • Concave lens
  • Spherical aberration
  • Chromatic aberration
  • Ray tracing
  • Telescopes
  • Examples of investigations and measurements
OX-04.01 Properties of lenses
By means of the DPSS laser (9) and the beam fan generator (6) a beam fan is generated and serves as a ray tracer. It passes the first lens and the beam track display (13). Inside the display the beam becomes visible due to embedded nano fluorescent particles. A set of various lenses like convex, concave, thin and thick lenses (17) is provided to study the respective properties as single lens as well in combinations of it.
OX-04.02 Keplerian telescopes or refractor
With pairs of lenses combined out of the provided lenses (2,4,5,6) are used to set up a telescope which has been invented by Kepler. John Dolland improved the optical arrangement by using an achromat as front lens. Both types can be set up on the rail and their properties determined. The rail can be taken into one’s own hands and views through the lenses impressively demonstrates focusing, lens error and magnification.
OX-04.03 Galilei’s telescope
Whereas the Keplerian telescope used a convex lens as eye piece the genius idea of Galilei was to apply a concave lens (3) for it. This reduces also the length of the telescope. In the same way as for the Keplerian telescope this type also can be taken into one’s own hands. For the front lens or objective either a simple convex lens or an achromat having the same focal length are used to understand the problem of spherical and chromatic lens errors.
OX-04.04 Spherical and chromatic aberration
The laser (10) is substituted by a white light LED (9) which emission consists of green red and blue radiation. By means of the filters provided (15) either the whole spectrum is used or just one of its components. A test slide (15) and the lens to be investigated (5,6) are used to create an image on the screen(1). It will be noticed that the quality of the image like focus and distortions depends on the wavelength as well as the type of lens. It will be noticed that the lens errors will increase towards the edge of the lens. By blocking these rays by lets say a piece of paper with a hole improves the image, however reduces the intensity. The method is often used to improve the imaging quality of optical instruments.
  • P5824 Refraction through lenses consisting of:
12B-01801Optical screen 80 mm x 40 mm with horizontal and vertical scale
24B-00401Plano-convex lens f=40 mm, mounted in click 30
34B-01001Biconcave lens f=-20 mm, mounted in click 30
44B-06101Achromat f=40 mm, mounted in click 30
54B-06401Biconvex lens f=150 mm, mounted in click 30
64B-08601Achromat f=150 mm, mounted in click 30
74B-09001Beam fan 5 x mounted in click 30
8ED-00101Adaptive power supply APS-05
9LS-00101LED white
10LS-01101DIMO 532 nm
11MC-01003Screen holder on carrier 20
12MC-02601Profile Rail MG 65, 500 mm
13XM-03101Beam track display, 50 mm
14XM-03201Beam track display, 100 mm
15XM-10101Set of filters and mask
16XM-11003Mounting plate, including carrier 20 mm , C30
17XM-11101Adjustment holder, 4 axes, carrier 20 mm
18XM-11201Lens demonstrator assembly