3B Scientific SEK Optics - Manual (Page 79)

Exercise
Examine whether the spectral colours can be combined to form white light!
What do we need?
1 Optical lamp
with power supply unit
1 Base plate
1 Focusing lens “+100”
1 Focusing lens “+50”
1 Aperture holder
1 Single-slot aperture
1 Prism
1 Screen
1 Plane-parallel plate as support
1 Plastic cylinder filled with water
1 Mask
Conducting the experiment
1. Attach the mask to the base plate! Place the optical lamp on the left side of the base plate, so that
the light emerges conically to the right!
2. Place the screen approx. 50 cm outside the base plate! Place the “+50” lens in front of the optical
lamp!
3. Insert the single-slot aperture into the aperture holder, which is placed in front of the lens!
4. Place the “+100” focusing lens between the optical lens and the screen as marked on the mask!
The slot must be projected onto the screen and focused with the lens!
5. Place the prism with the plane-parallel plate as a support onto the spot marked on the base plate!
6. Move the screen to the side until you can see the full spectrum on the screen!
7. Place the cylinder fully filled with water between the prism and the screen! The distance between
the cylinder and the screen must be approx. 2 cm!
8. Record your observations!
9. Sketch the beam path when the spectral colours are combined!
ELWE Physical experiments for education in natural science and engineering
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1 SEG - OP 7.2 Recombination of Spectral Colours