A spectroscope is equipment that allows us to determine that they are you throw the things. It works disturbing the colors.

Luz Fluorescente

The photography of above took control of our spectroscope. It is possible to be seen a shining green line, a shining line purple and a line very weak orange. These lines indicate that the mercurior is the cause of the light. This light comes from a fluorecente center and these work making warm up mercury until this it shines. The blue light purple of mercury (and invisible ultraviolet light) causes that the white phosphorus within the tube shines with white light.

How It is constructed


  1. 1 CD or DVD
  2. A cardboard box
  3. Razor blades
  4. Cardboard tube (it is possible to be used those of the interior of toilet paper)
  5. Sticky tape
  6. Aluminum paper

Our spectroscope has three main parts. The window to place the razor blades. A diffraction grid throws of a CD and a window of observation, of a cardboard tube. We must make sure that correctly the three are aligned.

The cardboard tube is placed on the box and two circles are drawn soon to cut as it is seen in












The oval figure is cut. This will allow that the tube is placed a little inclined. The following step is to make the window for the razor blades, for this inferior to the razor blades is cut to a rectangle of size slightly and they are placed these edge to edge and they are thrown out of reach to the cardboard box.






Now we placed the CD to a flank of the cardboard box just before ventan it with the razor blades. The side of the CD that does not have impression must give the window. One is thrown out of reach with sticky tape.






Down we see that the box has been closed and to all the sides and other openings with sticky aluminum tape are being sealed to avoid the entrance of light to the box. Black fine cardboard can also be used.







Now simply it is to place the tube and to make the adjustments. We must observe by the tube until we see the phantom of light produced by the CD. In this point it is come to hold the cardboard tube with glue.







We hold the box and we pointed the opening with the razor blades at a light source. An incandescent center will not show a phantom with shining lines because solid object comes deun caleinte (tungsten filament). The gases caleintes are those that produce lines, then is due to use equipment with the lights that contain steam in the interior.

Light of a Neon center

The photo of above shows the light of a neon center. We can see that she is compound of several colors, but mainly in the red phantom and orange of the phantom. The light is throws of waves and each wavelength is a color. The neon light shows waves of these lengths:

  • 540 nanometers (very weak) green
  • 585 nanometers yellow
  • 588 nanometers yellow
  • 603 nanometers orange
  • 607 nanometers orange
  • 616 nanometers orange
  • 621 nanometers red-orange
  • 626 nanometers red-orange
  • 633 nanometers red
  • 638 nanometers red
  • 640 nanometers red
  • 650 nanometers red
  • 660 nanometers red
  • 692 nanometers red
  • 703 nanometers red

Phantom of light of a white LED.

Many light sources can be observed and to study them (and until photographing them) is not recommendable to observe the Sun in direct form.

It is possible to be observed the light sources of the lights of the streets.


A CD is an example of a Grid of reflección, but a meor spectroscope with a Grid can be done of Diffraction. These last ones take control of lasers and are of much quality. An example of application of these grids is the rainbow lenses that are seen down. In order to make a spectroscope of diffraction it is possible to be consulted in our catalogue (Click here).




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